updated for OF 0.8.0+ GLFW, added Fluxus Repl & File browser

This is a Fluxus featureset improvement. Try it out before any merging is done. I basically added the Fluxus Repl (Read-Eval-Print Loop) aka console and the file browser as well as some customizations of both. The major changes are:

* added prelim GLFW support (see note below), Glut support deprecated but can be used via defining  OFX_GLEDITOR_GLUT
* ALT-E: now executes the current script, ALT+R / ALT+0 which to the REPL (console)
* removed current editor text and addTimestamp when saving (not that useful)
* runScriptEvent is now executeScriptEvent
* removed the save event since this is handled via the file dialog now
* ALT-D: is now save as
* ALT-S: now saves internally, opens save as if no file name has been set
* saveFile and loadFile no longer have default filenames
* ESC no longer exits the app since it is used to exit the file dialog
* Fluxus classes which haven't been adapted or rewritten are now in `src/fluxus so project files would need to be updated. (I did this for the Xcode project already)
* a custom Logging class automatically pipes all ofLog prints to the Repl (minus headers)

*Note: The biggest issue is the bug with keycodes in GLFW in OF 0.8.1. I have a hack in there for now but I'm not sure if this will work with a non-US keyboard. At the very least, I wanted to get something working until the fix comes with OF 0.8.2 and we can update it then. It seems like ALT may not work with GLFW in which case I'm thinking of changing the modifier key to CTRL. Thoughts?*

See relevant key code here: https://github.com/danomatika/ofxGLEditor/blob/master/src/ofxGLEditor.cpp#L165