Improve IDE configuration

[jankeromnes]

Stolen from: JanitorTechnology/dockerfiles#32 (comment)

We should also add the following user configurations to our Cloud9 workspace type:

• Code editor font-size: 14 (instead of 12)
• Default indentation to 2 spaces (instead of 4 spaces)
• Strip trailing spaces on save by default
• Maybe move the 80-chars visual indicator to the 100-chars mark?

[nt1m]

Strip trailing spaces on save by default

Didn't you mention you were against this ? (I'm not)

[nt1m]

Btw, this should probably be in dockerfiles.

[jankeromnes]

Didn't you mention you were against this ? (I'm not)

I'm all for automatically stripping whitespaces everywhere! 😄

[jankeromnes]

@etiennewan would you know where to configure the above values in Cloud9 SDK? To me it seems that they live under /home/user/${project}/.c9/ (maybe project.settings or so), however this isn't convenient for us because ${project} is different for each project image.

Is there any way to tell Cloud9 SDK to use some project settings, that doesn't involve touching the workspace's .c9 folder? (Which doesn't even exist at image creation time)