[SourcesManager] Ignore repos with unreachable sources on update
[CHANGELOG] Update
Fix method calls to follow proper conventions
Merge branch 'master'

Conflicts:
	CHANGELOG.md
[Sandbox] Use the realpath of the root.

Fixes pod lib lint
Closes #1566
Merge pull request #1595 from Kapin/unreachable-repo-fix

[SourcesManager] Ignore repos with unreachable sources on update