Correctly detect pip installation for pip 1.1 Thanks to @kblin
Enable installation with pip using Python 3.3. Uses workarounds from numpy's setup.py. Thanks to @lgautier
Put Python requirements above library requirements in README
Shorten Python version information in README.

Using Markdown to display nicely on GitHub too.
More README file tweakings

No need to run TravisCI tests [ci skip]
Updated installation doc regarding Python versions
Updated NumPy ver in docs; Consistent Unix style prompt $
Updated some module names in the install docs

No need for TravisCI tests [ci skip]
Ported Bio.trie to Python 3
Fix Bio/triemodule.c for Python 2.5
Fixing a typo
Remove deprecated 'center' aliases in GenomeDiagram
Unit test showing pure Python vs C code difference in PWM code.

Based on an example from Marco Galardini on the mailing list.
Consistent handling of mixed case in both C and Python PWM code
Comment out failing test in short term
Revert "Comment out failing test in short term" (fixing it now...)

This reverts commit e8e656d3e840b410f4f4b2b3e72944187fee0d3a.
Handle unexpected letters in Python PWM code as in C version
Remove line from testing bug fix
Hack for Python 2.5 on Windows where float('nan') fails
Add warning to Seq __hash__ like that for __cmp__

Suggested by Sergei Lebedev via Twitter.