EndlessAdapter: Improve data changed handling

GerritSearchView: Add method to obtain keywords
AgeSearch: Fix issue in timestamp parsing
CardsFragment: Fix adapter wrapping; use timestamp instead of sortkey
 when fetching newest changes
GerritURL: Add copy constructor
SearchKeyword: Trim quotes off parameter; make parcelable
ChangeListProcessor: Don't use sortkey; use direction when determining
 whether to sync.

Change-Id: Ic2c6a3b61a1bb695d89dfd92181955166cf9bac4