Merge pull request #108 from ayrton04/hydro-devel

Merging UKF addition
Updating changelog prior to 1.1.6 release
1.1.6
Merge pull request #116 from ayrton04/hydro-devel

Merging changes from ayrton04's repo
Merge pull request #120 from ayrton04/hydro-devel

Merging changes from ayrton04's repo
Merge pull request #130 from ayrton04/hydro-devel

Fixing issue #128
Merge pull request #136 from ayrton04/hydro-devel

Some major changes (largely organizational) to fix some issues with mixi...
Merge pull request #138 from ayrton04/hydro-devel

Adding failure callbacks for tf message filters
Merge pull request #143 from ayrton04/hydro-devel

Fixing arguments in TFtoState method
Merge pull request #149 from ayrton04/hydro-devel

Fixing base EKF and UKF tests
Cherry picking outlier rejection changes from PR #146