Added rpi target instead of auto-detection, since it's unreliable cross-platform.
This will make it possible to add special treatment for RPi in the future anyway.
Cleaned up cross-platform default file; datasheet/manual should work on Windows/Mac now also.
Removed hard references to PropellerIDE in top-level makefile; removed unneeded dependencies from travis build.
Auto-escape VERSION string quotes if running on Windows MINGW to allow compile with new versioning.
Merge branch 'master' of https://github.com/bweir/PropellerIDE
Merge https://github.com/konimaru/PropellerIDE

Conflicts:
	.travis.yml
Create path line editors with single function instead of copypasta.
Refactored more duplicates in Preferences class.
Merge branch 'master' of https://github.com/bweir/PropellerIDE
Merge pull request #14 from bweir/master

More refactoring; added platform-specific resource path defines