Fix broken link to TriG syntax specification.
Merge pull request #342 from cmarat/patch-1

Fix broken link to TriG syntax specification.
Added test for issue 345. Fixes #345. Fixes #336
removed incorrect test
add tests for initBindings with/without Variable and leading '?'
travis doesn't support py2.5 anymore (see #349)
Merge pull request #348 from drewp/master

add tests for initBindings with/without Variable and leading '?'