Merge tag '0.5' into develop

Version 0.5
chore: import pyannote.core structures with tvd
chore: rename "www" to more generic "resources"
fix: avoid variable name conflict
fix: get rid of "args" variable
fix: use "dummy" variable instead of unset "episode"
style: PEP8
style: PEP8
chore: rename "www" to more generic "resources"
style: PEP8
feat: add support for optional "type" field
improve: add option to load from disk or memory

Method get_resource() now tries the following options in this order:
  - get_resource_from_memory (works if it was loaded before)
  - get_resource_from_disk (works if it was dumped before)
  - get_resource_from_plugin (used as a backup plan)
git: ignore IPython notebook checkpoints
doc: add CHANGELOG for tvd 0.6
Merge branch 'release/0.6'