Rename `Symbol` var to `_Symbol` to avoid problems with Babel v6.4.0.
Rename `Symbol` var to `_Symbol` to avoid problems with Babel v6.4.0.

rlugojr/lodash,steelsojka/lodash,steelsojka/lodash,beaugunderson/lodash,rlugojr/lodash,msmorgan/lodash,msmorgan/lodash,beaugunderson/lodash