code comment cleanup
let's go ahead and be thorough and explicit

	if ( ! is_php(5))

becomes

	if ( ! is_php('5.0.0'))

ref: http://codeigniter.com/bug_tracker/bug/8475/
Added CI cheatsheets
Clarified required parameters.
Clarified required parameters (again)
Modified MSSQL driver to use mssql_get_last_message() for error messages.
example fix
comment fix
example fix
example fix
Fixed a bug in the Calendar library where the shortname was output for "May".
Fixed a bug in the language class when outputting an error for an unfound file.
changes some EE references to CI in the styleguide
updating xml_from_result to check for list_fields instead of field_names
removed an unneeded regex
reverting until further testing can be done
removed an unneeded regex
prep for 1.7.2 release
adding accept-charset to form_open()
some user guide corrections in code examples
a minor grammar tweak