Removed wrong log message
improved robustness of package load if checked out via git
Merge branch 'master' into luabackend

Conflicts:
	tex/latex/pgfplots/pgfplots.sty
refactoring
refactoring
added additional switches to disable the lua backend if needed
Added additional properties for LUA backend + improved logging
code cleanup
fixed bug in super constructor invocation (used wrong 'self' argument)

includes code-cleanup
refactoring: LUA class instantiation now uses '.new' instead of operator()
added LUA support for colormap lookups (saves ~8% time for surface plots)
Added support of LUA survey for standard plot handlers