add make distcheck and Module::Build to Travis tests

.travis.yml

@@ -11,8 +11,11 @@ addons:
     - texinfo
     - texlive
     - texi2html
-before_install:
+install:
   - autoreconf --install
   - eval `perl -V:siteprefix`
   - ./configure --prefix=$siteprefix && make
-after_failure: find /home/travis/.cpanm/ -name build.log | xargs grep .
+  - make cpanm
+script:
+  - make distcheck
+  - perl Build.PL && ./Build distcheck

Makefile.am

@@ -147,6 +147,16 @@ lib/Stow/Util.pm: lib/Stow/Util.pm.in Makefile.am
 # The below rules should only be needed by developers.
 ##############################################################################
 
+cpanm:
+	cpanm --quiet --installdeps --notest .; \
+	CPANM_RESULT=$$?; \
+	if [ $$CPANM_RESULT != 0 ]; then \
+	    echo ---------------------------------------------------; \
+	    cat ~/.cpanm/build.log; \
+	    echo ---------------------------------------------------; \
+	    exit $$CPANM_RESULT; \
+	fi
+
 doc/stow.8: bin/stow.in Makefile.am
 	[ -d doc ] || mkdir doc # required in vpath mode
 	$(edit) < $< | pod2man > $@