- add content-encoding response header support:
 - new functions:
  - char *get_content_encoding(const char *filename)
  - void dump_encoding(void)
  - void add_encoding(const char *extension, const char *encoding)
  - void print_content_encoding(request * req)
 - some small whitespace changes in hash.c and response.c
- remove unused global function prototype get_mime_hash_value

Conflicts:
	src/defines.h