Fix RbConfig / Config warning in Ruby 1.9.3.

"Config" is deprecated in Ruby 1.9.3, in favor of "RbConfig". This
patch uses whichever is available, preventing Ruby 1.9.3 from printing
a deprecation warning when redcloth is loaded.
Merge pull request #11 from purcell/fix-rbconfig-warning

Fix RbConfig / Config warning in Ruby 1.9.3.
Add RSTRING_NOT_MODIFIED header for Rubinius
Version bump
add license information to the gemspec

This way it can be queried using the rubygems.org API
Merge pull request #15 from jordimassaguerpla/master

add license information to the gemspec
Bump dependency versions
lazy load latex_entities.yml
Merge pull request #16 from charliesome/lazy-load-yaml

Lazily load latex_entities.yml
Changelog entry for lazy-load latex
Initial Travis CI config
merged upstream