Merging conflicts using value comparison
Merge branch 'master' into merge
Basic operations on repository
Add list() operation to Repository interface
Explain keys
Add exists() operation to Repository interface
Compile format string to regex pattern
@vio Empty title should be empty string, not None

[ci skip]
indent fix for readability.
Empty title generates empty string instead of None
Merge pull request #19 from Kjwon15/indent-fix

indent fix for readability.
Fill error types in except statement with no error types
Open original http opener when request data not in mocking table
fix indent for `content`
Merge pull request #20 from Kjwon15/indent-fix

fix indent for `content`
Read-only stage
Merge branch 'merge'
Generator equality test available
Content has source_uri attribute, not uri
Source and id field need xml base