Add HDF5 libraries to .travis.yml

These were accidentally removed in a previous pull request.
ENH: biom_open is now a contextmanager
MAINT: resolving conflicts
MAINT: resovling conflicts
BUG: Use requirement.txt instead of setup.py
STY: Fix PEP8 nuances
MAINT: Fix version specifications for the install

Numpy was being installed by conda and was tried to be installed by pip
with the requirements file. The version of h5py was not installed.
MAINT: updating input handler to support the change in biom_open
MAINT: removed h5py from table
MAINT: h5py tests in to and from hdf5
MAINT: setting a few vars for h5py
MAINT: better structure for close, thanks @Jorge-C
DOC: Add note to ChangeLog.md about NumPy suppor
MAINT: better wrap with try/except, thanks @Jorge-C
Merge pull request #298 from ElDeveloper/hdf5

Add HDF5 libraries to .travis.yml
Merge pull request #299 from wasade/safe_hdf5_opener

Safe hdf5 opener
BUG: Fix broken biom command

The command had options that were no longer needed, these were removed
as instructed by @wasade.
Merge branch 'master' of git://github.com/biocore/biom-format into biom-bug
Merge pull request #300 from ElDeveloper/biom-bug

BUG: Fix broken biom command
BUG: shape was not being passed to sparse constuctors