Don't allow getting annotation from non-existing class properties
Merge pull request #79 from php-annotations/74-verify-that-property-exists-before-reading-it-s-annotations

Don't allow getting annotation from non-existing class properties
Fixing issues in test framework:

- expected exception wasn't reset after each test
- test suite wasn't assessing that expected exception wasn't thrown at all
Merge pull request #81 from php-annotations/test-framework-fixes

Fixing issues in test framework
Adding more tests to increase coverage

- solving problems with too long lines
- code usage in test constructor wasn't reflected in coverage report
- simplify exception catching in existing tests