Add some stuff to gitignore
Small fixes for the makefile

* Fix echo to use -e (needed on linux when printing color escape codes)
* Remove the GCC variable, as the same need can be filled with the built
  in CC variable
* Add the lib_gtk_glue dependency to building the rust library
Merge pull request #4 from Blei/fix-makefile

Small changes
foobar in license...
add GtkToolShell trait
add toolbar + pkgid attribute
add gtktoolitem + impl gtk::Toolbar.
add gtk::SeparatorToolItem
impl gtktoolitem trait default methods
replace 2 ~str by &str in expander
add GtkToolButton trait + check return *c_str from gtk (return now Option<~str>)
add  gtk::toolbutton
finalize toolbutton family.