Bump up pip requirement to latest.

[jkarni]

Solves an issue with using git > 1.8.1 for github based pip requirements.

[jkarni]

@jzoldak @rocha

Tested on a mac.

[singingwolfboy]

Can anyone who tests this pull request test #566 as well? Same principle: simply updating libraries in our requirements files.

[jzoldak]

Looks like the version was not upgraded when executed on the jenkins server. Needs more investigation before merging. It seems that if an old unpacked build file exists, pip will just use that one. Here's from the feature branch tests job:

00:03:56.546 Downloading/unpacking pip>=1.4 (from -r requirements/edx/base.txt (line 38))
00:03:56.546   Running setup.py egg_info for package pip
00:03:56.546     
00:03:56.546     warning: no files found matching '*.html' under directory 'docs'
00:03:56.546     warning: no previously-included files matching '*.txt' found under directory 'docs/_build'
00:03:56.546     no previously-included directories found matching 'docs/_build/_sources'
00:03:56.546   Requested pip>=1.4 (from -r requirements/edx/base.txt (line 38)), but installing version 1.3.1

However, when I wiped out the Workspace on the feature branch manual job then ran this branch, pip was updated correctly:

00:01:11.125 Downloading/unpacking pip>=1.4 (from -r requirements/edx/base.txt (line 38))
00:01:11.125   Using download cache from /mnt/pip-cache/https%3A%2F%2Fpypi.python.org%2Fpackages%2Fsource%2Fp%2Fpip%2Fpip-1.4.tar.gz
00:01:11.125   Running setup.py egg_info for package pip
00:01:11.125     
00:01:11.125     warning: no files found matching '*.html' under directory 'docs'
00:01:11.125     warning: no previously-included files matching '*.rst' found under directory 'docs/_build'
00:01:11.125     no previously-included directories found matching 'docs/_build/_sources'

Verified on Jenkins (ubuntu).
Tested on mac with pip install -I pip==1.3 then rake lms which upgraded it to 1.4.

👍

[rocha]

For some reason my dev environment was already running pip 1.4.

👍