added: pthread_recursive_mutex
changed: rename mpio -> jubatus-mpio

+ changed: libmpio -> libjubatus_mpio
+ changed: include files install dir %prefix%/include ->
  %prefix%/include/jubatus
changed: rename directory mp -> jubatus/mp
fixed: add ruby "-I." option to preprocess
replace PTHREAD_MUTEX_RECURSIVE_NP -> PTHREAD_MUTEX_RECURSIVE
fix copyright
fixed NOTIC, AUTHORS and version
change libjubatus_mpio.so version to 0.4.0
update README
Merge branch 'release/0.4.0'