Import pdb/ipdb (late, only when used) in `set_trace`

Fixes https://github.com/calebsmith/django-template-debug/issues/21
Add myself to AUTHORS
Merged Jeff's fix for nested contexts
Refs #25 - Adds Django1.6 test discovery fixes and tox configs
Refs #25 - Fixes tests to work with Django1.7. Adds Python3.4 to tox
Fixes #27 - Don't getargspec for C routines
Fixes #26 - Adds Python3 and other metadata to setup.py
Refs #27 - Improves get_details test for C extensions

Makes the test stop erroring for Python2.6 and adds a comment to explain
the approach taken and purpose
Refs #25 - Simplifies test settings/setup so example.settings is used

Removes requirement of DJANGO_SETTINGS_MODULE being set for testing
Removes unused code in debug_tags and improves comments
Merge pull request #30 from calebsmith/feature/25-new-envs

Tests/Setup and bugfixes for newer Pythons/Djangos
Merge pull request #28 from calebsmith/feature/26-python3-metadata

Fixes #26 - Adds Python3 and other metadata to setup.py
Merge branch 'develop' into feature/27-fix-get-details

Conflicts:
	template_debug/tests/test_utils.py
Refs #27 - Fixes unittest to fail rather than error from get_details()

Also fixes an indentation/scope related bug from the previous merge
conflict resolution.
Merge pull request #29 from calebsmith/feature/27-fix-get-details

Make get_details work for objects with C routine extensions
Refs #24 - Adds a test requirements file and some developer docs
Removes behavior of popping 'block' from the context
Adds a travis yaml file