Fixed compiler warning "Semicolon before method body is ignored"

Fixed Xcode compiler warning "Semicolon before method body is ignored"
in Reachability.m. description method had a semicolon after the method
definition.
Merge pull request #50 from stevekohls/master

Fixed compiler warning "Semicolon before method body is ignored"
Merge branch 'master' of git://github.com/tonymillion/Reachability