Add a 'fonttools' command-line tool that simply runs modules

ttx is now equivalent to:
$ fonttools ttx

pyftsubset can be called as:
$ fonttools subset

varLib can be called as:
$ fonttools.varLib

Also adds a executable at toplevel called fonttools, such that
with "./fonttools ..." one can run stuff without installing.
Python seems to automatically include ./Lib into its search path.

Lib/fontTools/__main__.py

@@ -0,0 +1,31 @@
+from __future__ import print_function, division, absolute_import
+
+def main(args=None):
+	import sys
+	if args is None:
+		args = sys.argv[1:]
+
+	# TODO Add help output, --help, etc.
+
+	# TODO Handle library-wide options. Eg.:
+	# --unicodedata
+	# --verbose / other logging stuff
+
+	# TODO Allow a way to run arbitrary modules? Useful for setting
+	# library-wide options and calling another library. Eg.:
+	#
+	#   $ fonttools --unicodedata=... fontmake ...
+	#
+	# This allows for a git-like command where thirdparty commands
+	# can be added.  Should we just try importing the fonttools
+	# module first and try without if it fails?
+
+	mod = 'fontTools.'+sys.argv[1]
+	sys.argv[1] = sys.argv[0] + ' ' + sys.argv[1]
+	del sys.argv[0]
+
+	import runpy
+	runpy.run_module(mod, run_name='__main__')
+
+if __name__ == '__main__':
+	main()

fonttools

@@ -0,0 +1,6 @@
+#!/usr/bin/env python
+from __future__ import print_function, division, absolute_import
+from fontTools.__main__ import main
+
+if __name__ == '__main__':
+	main()

setup.py

@@ -68,6 +68,7 @@ setup(
 	],
 	entry_points={
 		'console_scripts': [
+			"fonttools = fontTools.__main__:main",
 			"ttx = fontTools.ttx:main",
 			"pyftsubset = fontTools.subset:main",
 			"pyftmerge = fontTools.merge:main",