Change readers #each implementations to allow creation of iterators
by calling Enumerable methods (#each, #each_with_index, etc.)
without a block.
Added travis badge
Merge branch 'master' into ci-enumerators

Pulling in travis stuff
Merge branch 'master' into ci-enumerators
Merge branch 'master' into ci-enumerators
Merge branch 'master' into ci-enumerators
Merge branch 'master' into ci-enumerators
Merge branch 'master' into ci-enumerators
Merge branch 'master' into ci-enumerators
Merge branch 'master' into ci-enumerators
Merge pull request #16 from ruby-marc/ci-enumerators

Ci enumerators