add basic e2e tests for HTTP/1
now the test depends on h2o
[travis] install Perl modules mandatory for testing
verbose output
run the unit tests before end-to-end tests
install ab
don't run tests when install cpanm
recover the test removed in commit 5138594
run HTTP/2 (w. Upgrade) tests using nghttp2
[travis] install nghttp2
log output to stderr
install nghttp2 to /usr, so that solib can be found (at /usr/lib)
install nghttp2 (merge branch 'kazuho/expr/travis/install-nghttp2')
add HTTPS tests
report error in detail in case of SSL configuration error
add certificate and private key used for testing
check OpenSSL version before running HTTPS/2 test
add end-to-end tests (merge branch 'kazuho/expr/e2e-test')