incorrect coloring of string literals in Python 3 and 2.7

[Tal Einat]

In Python 2.7 and 3.x, in byte string literals, the 'b' character should be colored as part of the string.

In Python 3.x, a 'u' character before parenthesis cannot be part of the string literal, and so should not be colored as part of the string.

[Tal Einat (taleinat)]

Digging a bit, it seems to me that the syntax coloring is done by GtkSourceView, and we might have to update its Python language specifications for Python 3.

[Noam Yorav-Raphael (noamraph)]

I reported a bug at https://bugzilla.gnome.org/show_bug.cgi?id=637555, together with a suggestion on how to fix it.

Since it's a cosmetic thing, I don't think there's a reason to have a workaround until the bug is fixed.

I think that there should be one syntax highlighting file for both python 3 and python 2. Highlighting an illegal 'u' in front of a string in Python 3 doesn't seem to me to be that bad.