[Application][Linux] Change D-Bus interface names

Change names to fit within the conventions in D-Bus after discussion
with Gustavo and Vinicius.

'/installed' now implements the org.crosswalkproject.Installed.Manager
interface and contains objects that implement the
org.crosswalkproject.Installed.Application interface.

'/running' is the same but with Running instead of Installed.
[Application][Linux] Renamed *ApplicationsRoot to *ApplicationsManager

Following the interface changes. Next patch will rename the files.
[Application][Linux] Rename the files to match class names
Merge pull request #1270 from cmarcelo/fix-dbus-interface-names

[Application][Linux] Fix D-Bus interface names after review