Requiring PCRE >= 7.0

There is a bug in libpcre < 7.0 that causes preg compilation errors that break
mockery. Libpcre >= 7.0 should fix this issue according to their changelog, but
the author has only tested on libpcre 8.31.
Added support for old style constructor
Merge pull request #152 from hason/old_constructor

Added support for old style constructor
Merge pull request #148 from davedevelopment/ignore-call-with-wrong-args

Ignore methods where expectation exists with wrong args
Merge pull request #146 from QuickenLoans/master

Requiring libpcre >= 7.0
Call constructor by default if partials requested