Run regress test for doc directory on Travis-CI

Run regress test for doc directory on Travis-CI.
But some test fail.......

```
$ pwd
/home/kiwamu/src/ATS-Postiats/doc/BOOK
$ git grep -A 4 xxx
INT2PROGINATS/CODE/CHAP_DATAVTYPE/Makefile:# xxx Should add "list_vt", "rbtree" to regress test
INT2PROGINATS/CODE/CHAP_DATAVTYPE/Makefile-#regress:: list_vt rbtree mergeSort insertionSort quickSort ; \
INT2PROGINATS/CODE/CHAP_DATAVTYPE/Makefile-#  ./list_vt && ./rbtree && ./mergeSort && ./insertionSort && ./quickSort
INT2PROGINATS/CODE/CHAP_DATAVTYPE/Makefile-regress:: mergeSort insertionSort quickSort ; \
INT2PROGINATS/CODE/CHAP_DATAVTYPE/Makefile-  ./mergeSort && ./insertionSort && ./quickSort
--
INT2PROGINATS/CODE/CHAP_EFFECTFUL/Makefile:# xxx Should add "brauntest" to regress test
INT2PROGINATS/CODE/CHAP_EFFECTFUL/Makefile-#regress: misc brauntest insort counter permord montecarlo hello echoline ; \
INT2PROGINATS/CODE/CHAP_EFFECTFUL/Makefile-#  ./misc && ./brauntest && ./insort && ./counter && ./permord && ./montecarlo && ./hello && ./echoline
INT2PROGINATS/CODE/CHAP_EFFECTFUL/Makefile-regress: misc insort counter permord montecarlo hello echoline ; \
INT2PROGINATS/CODE/CHAP_EFFECTFUL/Makefile-  ./misc && ./insort && ./counter && ./permord && ./montecarlo && ./hello && echo "foo" | ./echoline
```