add support for Elixir programming language

[bschineller]

add support for Elixir programming language http://elixir-lang.org/

[mpujari]

We already got support for Elixir, @PeterDP may be we need to update README.md file with the latest lang support (by executing ./ohcount4j -l)

Sample output below for project which uses Elixir.

#./ohcount4j -d ../elixir-array/

Elixir  ../elixir-array/test/test_helper.exs
Elixir  ../elixir-array/test/array_test.exs
Elixir  ../elixir-array/config/config.exs
Elixir  ../elixir-array/mix.exs
Unknown ../elixir-array/README.md
Elixir  ../elixir-array/lib/array.ex

#./ohcount4j ../elixir-array/
                            Ohcount4j Line Count Summary

Language                  Files       Code    Comment  Comment %      Blank      Total
------------------------  -----  ---------  ---------  ---------  ---------  ---------
Elixir                        5        719         33       4.4%        143        895
Unknown                       1         31          0       0.0%         13         44
------------------------  -----  ---------  ---------  ---------  ---------  ---------
Total                         6        750         33       4.2%        156        939

[PDegenPortnoy]

Diane has verified that Elixir is indeed supported and will update the README.md file

[PDegenPortnoy]

Confirmed support for Elixir and update to Readme file