use temporal layer num and remove gop size in external configure
Remove the unused iInitType parameter to the decoder Initialize method
Use the actual struct type instead of a void pointer to the decoder Initialize method
Remove completely unused variables and private fields
Merge pull request #301 from ruil2/temporal_num

use temporal layer num and remove gop size in external configure-- review request #94
Merge pull request #304 from mstorsjo/remove-unused-variables

Remove completely unused variables and private fields
Merge pull request #303 from mstorsjo/simplify-decoder-api

Simplify the Initialize decoder method