start modifying the rect example
finish update rect example
update hex
remove old images
update teh basic overview section
 update interface with meshkit
update mesh
update windows install images
clean up tex
Merge pull request #64 from judajake/update_doc

Update doc
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  clean up tex
  update windows install images
  update mesh
  update interface with meshkit
  update teh basic overview section
  remove old images
  update hex
  finish update rect example
  start modifying the rect example