Give erl-search-definition a meaningful return value

New helper erl-flash-region and use it in erl-find-source to provide
visual hint for successful searches.
Merge pull request #37 from leoliu/master

Give erl-search-definition a meaningful return value
erlext.el: Add support for float and new_float

Rename empty-symbol to erlext-empty-symbol.
erlext.el: Map elisp's hash table to/from erlang's map
erlext.el: Support smll- and large-bignums using math-bignum
Merge pull request #40 from leoliu/master

Float and map support for erlext.el
Merge remote-tracking branch 'massemanet/master'

* massemanet/master:
  erlext.el: Support smll- and large-bignums using math-bignum
  erlext.el: Map elisp's hash table to/from erlang's map
  erlext.el: Add support for float and new_float
  Give erl-search-definition a meaningful return value