Ability to read crop offsets from variables.
zero-terminated string, removed orientation constants
empty lines before else if
simplified code, configuration directive now called image_filter_crop_offset
renamed oxv and oyv to oxcv and oycv
line in 80 chars, fallback for string comparsion
shorter name + better offset fallback
using ngx_strncmp instead of ngx_strcmp
do not override explicit values
vanilla code
honor explicit configuration
Revert "vanilla code"

This reverts commit 738455c1857f921344d854f17f809ef032419b8c.
renamed crop_offset_* -> offset_
readability ftw
checking for not null terminated strings
configuration ability