fix typo in enum docs

RuPy 2012 in talk bug hunt
Merge pull request #646 from burningTyger/master

enum doc typo
Release 0.7.1
Add `make install` task

To change the install path, simply override the `INSTALL_PATH`:

    $ make INSTALL_PATH=/opt/local install
Improve docs and style on unicode.ex
Fix percent encoding algorithm used by URI.encode
Merge pull request #650 from tim/fix-uri-encode

Fix percent encoding algorithm used by URI.encode
Merge pull request #648 from devinus/install-task

Add `make install` task
Update rebar executable with utf-8 env fixes
/u is not required for Elixir regexes
Ensure System env functions properly handle utf-8 data
Ensure we are inside a git repository before retrieve git info, closes #649
Update version to 0.7.2.dev
CI doesn't like utf-8 chars as env, let's try iso
Remove previously deprecated code
Remove tests since utf-8 names on env variables are poorly supported depending on the OS and ERTS
Updated rebar with more env variable fixes
Improve IEx by using the -user option (ht @yrashk)
Do not exit after each run on ExUnit
Perfomance improvements to Enum.drop/take