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
Removes Ruby 1.8.7 from Travis matrix
Supports Ruby >= 1.9.3
Removes allow_failures from travis matrix
Removes unused blah.rb file
Changes chained ifs into case
Replaces .inject calls with .reduce

This is just personal preference. I'm trying to get more
familiar with the codebase so I make little changes.
Removes unnecessary &&
Changes if block to ternary operator
Moves if condition to end of statement
Inlines if condition to remove variable
whitespace
 Freezes "constant" strings
Adds jruby-head and allows it to rail
Refactors Generator#on_fetch for readability
Moves var assig to whole if block