Fixed apostrophe usage.
Fixed #27 -- Added a note about minimum version requirements.
Refs #4 -- Added a note about problems installing from source.
Updated release notes.
Reworked the organization of the docs.
Fixed #24 -- Added screenshots to tutorial and supported platform docs.
Bumped version number for v0.1.2 release.
Bumped version number for v0.1.3 development.