initial support for axon datafiles (gh-issue 28)
proper Y axis labeling in spike_browser, #47
Travis: added hdf5-tools
Travis: define package versions
Travis: do not use requirements.txt
Travis: added cython
Travis: install pywavelets via pip
Travis: try agiain with pip
Travis: added numexprt and tk headers
Travis: more luck with mpl, added back cython
Travis: added scipy to requirements
added test for Axon IO
download Axon file from G-Node portal
added Neo to requirements
Merge branch 'dev' into neo_support

Conflicts:
	requirements.txt
added sample Axon file
Merge pull request #85 from btel/neo_support

Support of Axon files via Neo library (closes #28)