add developer guide about git
use alternative way to test to reach 100% coverage
add module nextbiopy.util for Py2.X  compatibility
fix Seq class ref link
add matplotlib to dependency list in README.rst
use */api.py for python module loading

for quick loading all regular used functions and classes of a module,
one can now use

    >>> from nextbiopy.io.api import *

It should be more structured now.
add read_fasta function

it has the same functionality sa nextbiopy.io.Fasta. Since some people
may use nb.io.read_fasta() instead of open()-like file reading.
add FASTQ parser, first try
add fastq related tests
make doc more readable

Some subheads are added, since each docstring is long and hard to
distinguish. Currently they are defined manually, and I am not sure if
it is possible to use something like `autodoc` to achieve this part.

We should be more focused on Tutorial and Quick Start in future. They
are the parts that all new ones first visit.
add doc for git branching
update docstring example
remove Sprint! information
update git commit guide
add document for virtualenvwrapper

virtualenvwrapper has been highly recommended for virtual environemnt
managment. However, set it up in Python 3.x remains tricky so I haven't
put up the installation until now. There may be bugs following this
instructions.
Finish FASTQ reader

Now both singleline and multiline mode are supported by Pure Python
solution.

This will close #12. We will put C implementation in new issue.
fix fastq reader

There is a possible situation that quality record may start with '@', so
actually there is no good way to parse this FASTQ file efficiently.

Also, test_multiline.fastq added this special case.
there is non-ascii char in core/base.py line 119
there is a 3to2 modifying for compat in line 101~102
The class "Seq" should inherited "object" to be a new-style class in Python 2.x