Add class index to doxygen output
updated release notes
Add check for missing algo info structure.
updated release notes
Merge pull request #6 from mleotta/dev/enable-doxygen-class-index

Dev/enable doxygen class index
Merge pull request #7 from mleotta/dev/check-for-missing-algo-info

Dev/check for missing algo info
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  updated release notes
  Add check for missing algo info structure.
  updated release notes
  Add class index to doxygen output
  added release notes for v0.4.1.txt
Call loop closure on the first frame

Previously loop closure was only called after the first match
(the second frame), which caused the initial reference frame to
be the second frame, not the first.  This resulted in the
homography file being off by one.
updated release notes
Merge pull request #8 from mleotta/dev/fix-closure-ref-frame

Dev/fix closure ref frame
Merge pull request #9 from Kitware/release

Release
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  updated release notes
  Call loop closure on the first frame
Documentation changes.

Elaborated on some topics and fixed a few doxygen
control word issues.
Update release notes.
Remove duplicate line on comment.
Add message for error condition.