No need to store result in IEx.Config
Optimize binary handling in Integer.parse and Float.parse

We have used the following commands to compile those files
with the appropriate optimization info:

    ERL_COMPILER_OPTIONS="bin_opt_info" elixir lib/elixir/lib/integer.ex
    ERL_COMPILER_OPTIONS="bin_opt_info" elixir lib/elixir/lib/float.ex

More info at www.erlang.org/doc/efficiency_guide/binaryhandling.html
Fix docs for the [test_coverage] option of the [mix test]
Merge pull request #1785 from parroty/doc

Fix docs for the [test_coverage] option of the [mix test]
Optimise raise/1,2 at compile time

Where possible the type of the exception (1st argument) is inferred at
compile time instead of run time.
Fix typo s/Mix.Shell.error/Mix.shell.error/
Fix Version.parse/1 specs
Fix invalid raises in Code
Fix spec for Enum.chunks/4
Merge pull request #1786 from fishcakez/optimise_raise

Optimise raise/1,2 at compile time
Merge pull request #1787 from fishcakez/fix/mix_shell_typo

Fix typo s/Mix.Shell.error/Mix.shell.error/
Merge pull request #1788 from fishcakez/fix/version_parse_specs

Fix Version.parse/1 specs
Merge pull request #1790 from fishcakez/fix/enum_chunks_spec

Fix spec for Enum.chunks/4
Merge pull request #1789 from fishcakez/fix/code_raise_error

Fix invalid raises in Code