catkin build

Add support for catkin build & fix few things.

Did you take care of my comments about the instructions in the README? They were OK but with some minor mistakes or unclear steps.

@jsola Normally this pr shouldn't change a dime to the previous behavior. can you please assert that ?
If nothing changes please merge as it would ease greatly my life xD .
I'll take care of your remarks about the readme once I'm done fixing the numerous errors that come with enabling !86 (closed) .

OK i'll just check that the rest keeps working. For the rest I trust you!

Added 3 commits:

• 3065d2ac - strengthen gcc compilation flags
• 7b97ac52 - fix error type qualifiers ignored on function return type [-Werror=ignored-qualifiers]
• 050b90c6 - fix error: comparison of unsigned expression >= 0 is always true [-Werror=type-limits]

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Added 1 commit:

• fb94c952 - update readme

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Added 1 commit:

• 8848ef99 - readme indent

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Added 1 commit:

• 366037b5 - readme indent

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Unmarked this merge request as a Work In Progress

I think we are good to go

Mentioned in merge request !86 (closed)

Status changed to merged

Mentioned in commit 7f6f7889

Done