#176 enabled tests
#176 Created XML validator
#124 recreated problem
#124 question mark allowed after todo number
#178 using files method from Environment
Merge pull request #186 from krzyk/178

#186: pull request #178 using files method from Environment
Merge pull request #185 from krzyk/124

#124 question mark allowed after todo number
Merge pull request #184 from krzyk/176

#184: pull request #176 Created XML validator