Subscribe to any known topic

Fix _get_topic_type so that it can get the type of a topic that is subscribed to, even if it isn't published yet.
Update maintainership information of plugins I Authored and Maintain
Merge pull request #230 from trainman419/fix_bag_topic_close

Fix closing and reopning rqt_bag topic views
Merge pull request #233 from trainman419/plot_subscribed_topics

Subscribe to any known topic
clarify what should go into rqt_py_common
Merge pull request #237 from ros-visualization/clarify_py_common

clarify what should go into rqt_py_common
update changelogs
0.3.6
rqt_reconfigure: Fix bug in float range calculations

This only affected float parameters in which the minimum was well defined but
the maximum was infinite.
Merge pull request #241 from cottsay/groovy-devel

rqt_reconfigure: Fix bug in float range calculations
use queue_size for Python publishers only when available
Merge pull request #243 from ros-visualization/conditional_queue_size

use queue_size for Python publishers only when available
Merge pull request #236 from trainman419/py_common_plot

Document rqt_plot backend as public API
Start adding plot plugin
Add new plot plugin to plugins.xml
Add empty but working plot view
Tinkering with plot plugin
Add topic to plugin view constructor
Initialize plot widget on startup
Pull in adwilson's matplot plugin