Issues fix.

super.onPause() call moved to begining of onPause method according Google recomandations.

FpsMeter class removed from Image Manipulations and Face Detection examples as unused code.

New interface allows to get one RGBA or Gray frame from camera or both in the same time;
New interface fixes data rase in samples also.

simplify the logic of save binary

Add checks for valid values
Fix wording on some errors

Declare vars as locally as possible

Initialize local variables

Remove unused var "total"
Declare vars as locally as possible

Issue #2114

This follows SURF changes in 1f261c2f

Also corrected some indexes to be size_t.