Fix the whitespace stripper with new sandbox APIs.
Default to the active session when none specified.
Minor simplification.

This is equivalent.
Merge pull request #146 from robru/patch-5

Minor simplification.
Merge pull request #143 from robru/fix_whitespace_stripping_issues

Fix the whitespace stripper with new sandbox APIs. Fixes #142
Fix snippets breaking when using whitespace stripping.
Merge pull request #145 from robru/make_path_optional

Default to the active session when none specified.
Continuous completion tweak
Merge branch 'master' of github.com:zedapp/zed
0.10 changelog
Merge branch 'master' into expanded_extension_info
Make it possible for extensions to request certain insertables.