Added: const ofPixels& getPixelsRef() const;
Merge branch 'master' of github.com:bakercp/openFrameworks into feature-const-correct-ofTexture
Clean up git addition

* Verbosify git usage
* Move option in private part
* Fix getopts
Clean with git
implement git-tag switching

add ability to select another version of the library on clean & download
commands
move gitclone function

... to be in a better place.
add template to all libs

avoid unset variable errors
fix wrong path for git checkout
git-cloning more flexible
add some new git sources
fix download errors

* Git point not exist
* Follow git option
No Kiss for VS
implement GLFW => first VS complete lib
tess2 for VS2013
GLFW 3.0.2
add vsbuild function & make vs version a variable

* VS_VER => Visual Studio version
* function vs-build() <"path/to/sol.sln"> [action] [config]
* improve GLFW doc
add assimp git variables

don't forget addons, but they need to define some tags (at least one...)
avoid errors if no git tag
allow poco to use git option
updated libpng download link, closes #8