Consistent use of CCAssert

 * Remove @
 * Use CCAssert instead of CC_ASSERT (number of parameters differ between the two)
Assert implementation for Android

    * __android_log_assert is not stable
    * Uses __android_log_print instead
CCAssert uses CC_ASSERT directly

 * ... after call to cc_assert_script_compatible()
 * CCAssert will now report the correct line number
Merge pull request #1827 from folecr/assert_fix

fixed #1654: Assert fix for android.