Refactor graph backends into wrapper
Make DataPlot a proxy for its plot widget
Redraw after loading new data
clarify what should go into rqt_py_common
Add docstrings
Implement clear_values
Remove comment per discussion in #236
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