introduction: improved comments
gtest: added notion of 'undefined behavior'
typos
integer_types.cpp: second long forgotten.
integer_types.cpp: rephrasing.

this is better to understand (???).
arrays.cpp: consistency in comments.
fixed whites
Merge https://github.com/sensorflo/cppkoans

Conflicts:
	src/koans/arrays.cpp

I now put a point at the end of the sentence.
added GPL liscence file
small comment edit
pathtoenlightenment: reordered koan areas
various typos and whitespace fixes
Merge https://github.com/sensorflo/cppkoans

Stay up-to-date with upstream.
A period at the end of a sentence.