BUG: Don't add one-sample trajectories

Trajectories with one sample would fail to be displayed and these would
break the rendering of the animation.
BUG: Enclose queries in quotes

Not enclosing some keywords inside quotes would make jQuery error out
when looking for the queried elements.
TST: Add tests for one-sample trajectories
DOC: Add note to the ChangeLog about bugfixes
Merge pull request #289 from ElDeveloper/animations-issues

BUG: Fix a few bugs with animations