Added autoconf submodule in m4 directory.
Switched from SVN repos to GitHub repos.
Switched from SVN repos to GitHub repos.
Fixed merge of submodule.
Updated repository location information.
Add option to allow building PyLith from repo using PETSc tarball.
Updated version number information.
Updated repository info in documentation.
Updated more repository information in documentation.
Merge branch 'baagaard/fix-svn-to-git'

* baagaard/fix-svn-to-git:
  Updated more repository information in documentation.
  Updated repository info in documentation.
  Updated version number information.
  Add option to allow building PyLith from repo using PETSc tarball.
  Updated repository location information.
  Switched from SVN repos to GitHub repos.
  Switched from SVN repos to GitHub repos.
  Added autoconf submodule in m4 directory.