Fix Mustache#const_get! behavior

By default, each call to Module#const_get will fall back on Object
constants. Thanks to an API change in 1.9, the incantations to avoid
this behavior changed.
fixed typo in mustache.5.html
Update mustache.5
Updates .ronn and generates man and html pages
Don't install turn for Rubinius because it breaks in Travis
Refactors Generator#on_fetch for readability
Moves var assig to whole if block
Fixes #174
Version bump - v0.99.7
Use rbx-2 instead of rbx-2.1.1 for Travis

This ensures Travis auto upgrades to new versions of Rubinius 2.x.
Fixes #182 - cli errors log to stderr and exit properly
Version bump - v0.99.8
removes LOAD_PATH manipulation
Ignores IDE-generated files
Substitutes `assert !` with `refute`
Removes more LOAD_PATH mangling
Removes turn and switches test/unit for minitest
Fix Mustache#const_get! behavior

By default, each call to Module#const_get will fall back on Object
constants. Thanks to an API change in 1.9, the incantations to avoid
this behavior changed.
Simplifies const_get (no backwards support needed)