* Add Python 2.7.15 to the list of runtimes

Closes #691

* Update the default Python 2 to 2.7.15 everywhere

* fixed the bug for pypy-5.8.0

* changelog

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* python 2.7.14

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* pipfile > requirements.txt

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* check for python_full_version too

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* 2.7.14

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* warn when using an older version of python

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* requirements for anaconda buildpack

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* remove hashes for conda buildpack

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* improvements to pipenv python version detection

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* oops

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* oops

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* oops

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* echo not puts

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* try this

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* learn more

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* there we go

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* cleanups

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* cleanups

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* cleanups

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* unsupported

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* consistiency

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* be more specific

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* capitalize Pipfile.lock

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* attempt to force color

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* try this

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* try this

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* interactive

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* interactive

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* diagnose

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* try without -l

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* confirmed env working

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* just -c

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* use latest, to debug

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* no more bash

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* try …

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* don't use the git version of pipenv

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* oops

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* next version

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* 2.7.14

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* comment out force color bits

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* readme

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* more tests

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* more tests

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>

* ellipsis

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>