TST: Add base for test_examples
API: added Table.subsample
DOC: updated how ValueError is thrown
Merge branch 'master' of github.com:biocore/biom-format into issue_125_sample

Conflicts:
	biom/table.py
	tests/test_table.py
API: removed replace, thanks @josenavas
ENH: cython'd subsample
Merge branch 'master' of github.com:biocore/biom-format into issue_125_sample
Adding example for biom.table.Table.sum()
ENH: cythoned
Merge branch 'master' of github.com:biocore/biom-format into issue_125_sample
BUG/DOC: addressing @Jorge-C's comments
Fixing errors
Fixes #409
Fixing documentation
making parse_biom_table able to parse a subset, either form hdf5 and json
DOC: Improve documentation of Table
DOC: add exmaple for table.reduce
DOC: addressing @ElDeveloper's comments, thanks\!
BUG/ENH/DOC: Change arguments named id_ to id

Making a quick test in IPython, it turns out that there's no need to
have the variables named id_ as these won't shadow the built-in function
`id` anywhere but inside the methods, which is fine as right now having
these arguments superseded by an underscore is generating Sphinx
warnings, see this example:

(skbio)yoshikivazquezbaeza:~$ ipython
Python 2.7.6 (v2.7.6:3a1db0d2747e, Nov 10 2013, 00:42:54)
Type "copyright", "credits" or "license" for more information.

IPython 2.0.0 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.

In [1]: def foonction(id='x'):
   ...:     print id
   ...:

In [2]: foonction()
x

In [3]: id(foonction)
Out[3]: 4363449240
DOC: Change pyqi link