Load selected feed after a short timeout

Avoid firing multiple server requests if the user quickly clicks another feed or is navigating up/down the tree list with the keyboard.
Merge pull request #219 from mhaley/patch-1

Load selected feed after a short timeout
Revert "Load selected feed after a short timeout"

This reverts commit 17c5d44cf42f6c99786efbc45b788d910fb4c4be.
release 1.8
Merge remote-tracking branch 'upstream/master'