update element tests
TST: move figure test to core
TST: add axes & coordinates tests
BUG: minor JS fixes to axes and element
TST: add JS element test
TST: add html & plugin tests
BLD: Add Travis file.
DOC: Add build status badge to README.
Merge pull request #136 from danielballan/travis

Set up basic Travis builds on 2.7 and 3.3.
TST: update travis address in README
Merge pull request #132 from jakevdp/jstests

WIP: Improve javascript test coverage
install js to nbextensions on IPython 2.0

- not sensitive to CWD changes
- won't copy files unless updates are needed
- CWD behavior kept for IPython < 2.0
Merge pull request #130 from minrk/nbextension

ENH: install js to nbextensions on IPython 2.0
BUG: fix collections transforms to work with mpl 1.4
examples: remove unused imports
Merge pull request #141 from jakevdp/mpl1.4-fix

BUG: fix collections transforms to work with mpl 1.4
BLD: Run Javascript tests.
Merge pull request #139 from danielballan/travis-js

Include javascript tests in Travis CI builds
BUG: fix invalid HTML4 ids
BUG: make javascript ID generation HTML4 compatible