Add explanatory text for ASSERT.that(foo).labeled(Bar)...
fix punctuation
typo.
Update Javadoc APIs and version to 0.16
Merge pull request #1 from truth0/updateforbetterlabeledsubjects

Prepare for 0.16, including:

  * Bump version to 0.16
  * Add the 0.16 version of the API docs.
  * Add explanatory text for ASSERT.that(foo).labeled(Bar)...