Update gitignore structure.

Refactor out gitignore in /other/serialTest.
Add some more noticable headers.
Some simplifaction and restructuring.
Clean up some files.
Refactor out lib platform gitignore files.
Refactor out some gitignore files from AdvancedImageLoading.
Remove erroneously committed XCode project components. Closes #2057.
gitignore: correct comment spacing, minor updates.
PG submodule: update to latest module
set osx project template to use libstdc++
(instead of compiler default, which is libc++ on 10.9)
make LLDB the default debugger
(stops the popup from coming up every time you start a new project)
apply lib and debugger settings to iOS template
Merge pull request #2764 from admsyn/fix-tr1-mem-osx

Fix <tr1/memory> error on osx, ios
Merge pull request #2523 from bilderbuchi/gitignore-overhaul

Gitignore overhaul
Merge branch 'master' of https://github.com/openframeworks/openFrameworks.git into VS2013