Added nearly full support for GtkStatusIcon (minus the GtkMenu popping)
Add gtk_menu_item_set_label
Added wrapper for gtk_clipboard_wait_for_text
Add PixbufNewFromFile and Pixbuf.RotateSimple.
Add wrapper GetSelectedRows for gtk_tree_selection_get_selected_rows

Some extran comments and code cleanup by @jrick.
Add basic support for working with a widget's GdkVisual
added Ubuntu specific install directions

added some command line arguments for installing gotk3 on Ubuntu 14.04.
Add ProgressBar.Get/SetShowText.

We already had the .SetText method, but without being able to actually
enable showing text, it was rather useless.
IMPORT PATH MODIFICATION CHANGESET
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Please use this changeset as the first one on top of the conformal codebase.
Note that if there are new imports, they need to be changed as part of this
changeset. In general, use "git rebase" on github.com/conformal's version
and apply this changeset first.