Merge pull request #65 from infirit/1.6

Fix typo in AM_INIT_AUTOMAKE
Upate yahoo finance http adress
Require pygobject 3 now that it was ported to gi

Commit 540e2e460c8155a22b10c1712eec71c9bf25aea9 ported to
gobject introspection but this never reflected in configure.ac.