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
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 remote-tracking branch 'upstream/release' into release

* upstream/release:
  updated release notes
  Call loop closure on the first frame
  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
  Added support for building statically on Windows
  Removed TODO comment that was recently resolved
  Updated the default dashboard git url to point Kitware's GitHub repo
  Updated find module proceedures
  added better overview to readme doc
  rename README to README.md to indicate markdown syntax
  Include the PROJ include directory
Declare type_name() and impl_name() methods virtual.

It is more apparent that a method is virtual if it is always
declared as virtual.
Make destructor virtual.
Update release notes
Add virtual keyword to impl_name() method.