Don't use the Hash constructor if there's only one field
Merge branch 'obrok/hash-constructor'
Version bump to v1.1.1
Add travis-ci config
Add rake as a test/development dependency, use HTTPS
Merge branch 'wimdu-add-travis'
Change the Ruby versions tested in Travis

1.8.7 and 1.9.2 are end of lined, ree is dead, jruby-head will not be stable for a long time, and rbx was missing.

[ci skip]