Update to Node 5 in travis tests.
Update to Node 5 in travis tests.

beaugunderson/lodash,tonyonodi/lodash,Xotic750/lodash,Xotic750/lodash,boneskull/lodash,beaugunderson/lodash,msmorgan/lodash,Xotic750/lodash,tonyonodi/lodash,rlugojr/lodash,msmorgan/lodash,rlugojr/lodash,steelsojka/lodash,steelsojka/lodash,boneskull/lodash