Add gitter and wiki mentions

Author: canavandl

.github/ISSUE_TEMPLATE.md

@@ -1,12 +1,13 @@
 The issue tracker isn't the place for general support. For questions and
 technical assistance, come ask the
-[Bokeh mailing list](https://groups.google.com/a/continuum.io/forum/#!forum/bokeh).
+[Bokeh mailing list](https://groups.google.com/a/continuum.io/forum/#!forum/bokeh)
+or join the chat on [Gitter](https://gitter.im/bokeh/bokeh).
 
 For defects or deficiencies, please provide:
 * Description of expected behavior and the observed behavior
-* self-contained example code that generates the issue (if possible)
-* stack traceback and/or browser console error output
-* python, bokeh and browser versions
+* Self-contained example code that generates the issue (if possible)
+* Stack traceback and/or browser developer tools console output
+* Software version information output by `bokeh info` command
 
 For desired features, please provide:
 * Description of the desired feature

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,6 +1,7 @@
 All pull requests must have an associated issue in the issue tracker. If there
 isn't one, please go open an issue describing the defect, deficiency or desired
-feature.
+feature. You can read more about our issue and PR processes in the
+[wiki](https://github.com/bokeh/bokeh/wiki/BEP-1:-Issues-and-PRs-management).
 
 - [ ] issues: fixes #xxxx
 - [ ] tests added / passed