We no longer execute the doc_tests for elixir file helpers

Due to windows incompatibility, we removed some of the doctests for the
file helpers.
Skip symlink tests on windows
Skip color tests on windows
Fixed iex tests on windows

Elixirc was not properly invoked
Merge pull request #1333 from ToJans/master

Some more fixes for #1280
Fix typo in Module.get_attribute doc
Merge pull request #1335 from mururu/fix-typo

Fix typo in Module.get_attribute doc
Simplify runcmd on IEx
Import records that depends on others, closes #1334
Require Erlang 16B+
IEx autocompletion should support identifiers that include numbers

Closes #1337
Fix defrecordp definition of the <record>_t type

It should use the correct tag in the tuple to be correct.
Fix defrecordp documentation with regards to the type generated