Update README.rst
Whitelist external entities for HHVM/libxml.

Refs: facebook/hhvm@842d6fb
Merge pull request #423 from whatthejeff/hhvm-libxml-regression

Whitelist external entities for HHVM/libxml.
Switching to Behat3
Added default formatter, fixed spacing, removed redundant line
Moving tag filter to global, so that it can be overriden at CLI
Fugbix typo.
Merge pull request #425 from whatthejeff/patch-3

Fugbix typo.
Add missing matcher features.
Add missing matcher documentation.
Merge pull request #426 from whatthejeff/document-matchers

Improve matchers documentation.
Merge pull request #424 from ciaranmcnulty/behat3

Upgrade Behat to v3
Removing Generators from scrutiny
Merge pull request #427 from ciaranmcnulty/config-scrutinizer-fatals

Removing Generators from scrutiny
Rename behat.yml to behat.yml.dist
Added behat.yml in the ignore list
Replace `ocramius/instantiator` with `doctrine/instantiator`.

Refs: Ocramius/Instantiator#13
Flesh out the stubs and mocks documentation
Merge pull request #434 from richardmiller/add-to-stubs-docs

Flesh out the stubs and mocks documentation
Merge pull request #431 from whatthejeff/doctrine-instantiator

Replace `ocramius/instantiator` with `doctrine/instantiator`.