Setting up doxygen

File: Doxyfile
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- Initial doxygen configuration file (Doxyfile)

File: .gitignore
----------------
- Do not include the doxygen generated documentation files in the project
  repository
Modifed a few tags in Doxyfile

File: Doxyfile
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- Set OUTPUT_DIRECTORY, RECURSIVE, and FILE_PATTERNS tags
Playing with doxygen comments and formatting

File: GramSchmidt_App/src/GramSchmidt.cc
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- Modified a few doxygen comments to see how the documentation formatting
  changed
Merge branch 'doxygen_setup'

Doxygen has been set up to generate automated documentation in a format that
is acceptable for now. Further changes will be made as more code is written.