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Fix config resetting all values when one changes. 

Closes atom/settings-view#257
Merge pull request #3690 from atom/bo-fix-config-issue

Fix config resetting all values when one changes.
Pluralize Project API

This changes all APIs concerning paths and repositories on the project
to be plural, preparing us to switch to multi-folder projects. It
doesn’t make any changes to actually support multiple folders. Instead
we just wrap the previous return values in singleton arrays.

* constructor ‘path’ params -> ‘paths’
* getRootDirectory -> getDirectories
* getPath -> getPaths
* setPath -> setPaths
* getRepo -> getRepositories
Add Project::onDidChangePaths event
Prepare 0.135
Merge pull request #3691 from atom/ns-pluralize-project-api

Pluralize Project API
Merge remote-tracking branch 'atom-master/master'