Remove remaining c['www']['url']

This removes all the occurrences of ['www']['url'] after commit b53998a3fac5f15d0a1d5c7bd90561f7dfec779d
tests: set buildbotURL in tests
Use `''` as the default for repository

These repository field of a source stamp is not allowed to be None.
Don't require 'repository' in codebases

This also cleans up the documentation for the parameter.
Merge pull request #1406 from djmitche/sourcestamp-requires-repository

Use `''` as the default for repository and project
Finish PR/1417 (make test pass)
mention that we display all changes since the last successful build.
Merge pull request #1422 from benallard/pr/1417

Pr/1417
NightlyBase doesn't convert string in dayOfWeek param

No conversion is made of the value in dayOfWeek if it's a string. The
value is directly passed to croniter without proper conversion.
This fix handles both single string values and multiple comma separated
values as well as abbreviation in the string. ("0" "5,6" "0,fri" et.c.)
Merge pull request #1423 from benallard/patch-1

mention that we display all changes since the last successful build.
Updated variable name and comments
Merge pull request #1424 from gangefors/fix/nightly_doesnt_convert_string_in_dayofweek

NightlyBase doesn't convert string in dayOfWeek param
Minor update to the docs
Fix small typo in docs (s/smpt/smtp/).
Increase unittest coverage for getChangesForBuild
Improve the look of the build page
Not everything is now called tags
Fix bugs raise by the unittests when several codebases are used.
Merge pull request #1425 from benallard/patch-2

Minor update to the docs
Merge pull request #1428 from The-Compiler/fix-doc-typo

Fix small typo in docs (s/smpt/smtp/).