LatinIME: Only enable gesture mode if gesture lib is available

 * Prevents keyboard FC when gapps is not loaded.

Change-Id: I0d48e1cd80534513205f61913c798b48573ea38c
LatinIME: Add "more" keys to ALL the keys in Greek layouts

Change-Id: I120e7b94abd71baf24c97afbd20cf2c6c76df6ef