4.3.6: support fbexpect 2.6.1+

in the previous release, only fbexpect 2.7.0+ was supported

4.3.5: support and require fbexpect 2.7.0+

v4.3.5

support and require fbexpect 2.7.0+

4.3.4: support HHVM 4.27+

including current nightlies

4.3.3: support HHVM 4.21+

\preg_match with a by-ref &$matches argument is no longer supported

4.3.2: support HHVM 4.20+

This release adds HH_FIXMEs required by HHVM 4.20+.

4.3.1: support additional hhconfig options

This release supports the disallow_ambiguous_lambda hhconfig option

4.3: support current nightlies (4.14-dev)

This release requires HHVM 4.13 or above, and supports current nightly builds of HHVM.

Support current HHVM nightlies (4.7-dev)

v4.2.5

stop explicitly testing on 4.2

Support HSL v4.5.0+

v4.2.4

Support latest versions of the HSL

Supporty hh-codegen-verify-signatures on nightly releases

Make travis.sh use /bin/bash instead of /bin/sh

`foo/{file1,file2}.php` is a bashism.

Also add comment explaining why we're doing both that and regen'ing +
diffing