renamed class

X -> YHiolder
<a href='#crh-start'></a><a href='#crh-data-%7B%22approved%22%3A%20%7B%22https%3A//github.com/AlexeyDmitriev%22%3A%20%7B%22avatar_url%22%3A%20%22https%3A//avatars.githubusercontent.com/u/1193082%3Fv%3D2%22%7D%7D%2C%20%22comments%22%3A%20%7B%22General%20Comment%22%3A%20%7B%22html_url%22%3A%20%22https%3A//github.com/AlexeyDmitriev/tests/pull/4%23issuecomment-52402741%22%2C%20%22comments%22%3A%20%5B%7B%22body%22%3A%20%22%3Ashipit%3A%22%2C%20%22created_at%22%3A%20%222014-08-16T19%3A04%3A10Z%22%2C%20%22user%22%3A%20%7B%22avatar_url%22%3A%20%22https%3A//avatars.githubusercontent.com/u/1193082%3Fv%3D2%22%2C%20%22html_url%22%3A%20%22https%3A//github.com/AlexeyDmitriev%22%7D%7D%5D%2C%20%22title%22%3A%20%22General%20Comment%22%7D%2C%20%22Pull%20eb721b6be86a0df0e5e31cde396612063c2c6acc%20x.cpp%202%22%3A%20%7B%22html_url%22%3A%20%22https%3A//github.com/AlexeyDmitriev/tests/pull/4%23discussion_r16326236%22%2C%20%22comments%22%3A%20%5B%7B%22body%22%3A%20%22test%22%2C%20%22created_at%22%3A%20%222014-08-16T19%3A03%3A51Z%22%2C%20%22user%22%3A%20%7B%22avatar_url%22%3A%20%22https%3A//avatars.githubusercontent.com/u/1193082%3Fv%3D2%22%2C%20%22html_url%22%3A%20%22https%3A//github.com/AlexeyDmitriev%22%7D%7D%5D%2C%20%22title%22%3A%20%22File%3A%20x.cpp%3AL1-5%22%7D%7D%2C%20%22processed%22%3A%20%5B%22https%3A//github.com/AlexeyDmitriev/tests/pull/4%23issuecomment-52402741%22%2C%20%22https%3A//github.com/AlexeyDmitriev/tests/pull/4%23discussion_r16326236%22%5D%7D'></a>
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<img src='http://www.codereviewhub.com/site/github-approved-avatar.png'><a href='https://github.com/AlexeyDmitriev'><img src='https://avatars.githubusercontent.com/u/1193082?v=2' width=34 height=34></a>

- [x] <a href='#crh-comment-Pull eb721b6be86a0df0e5e31cde396612063c2c6acc x.cpp 2'></a> <img src='http://www.codereviewhub.com/site/github-remaining.png' height=16 width=60>&nbsp;<b><a href='https://github.com/AlexeyDmitriev/tests/pull/4#discussion_r16326236'>File: x.cpp:L1-5</a></b>
- <a href='https://github.com/AlexeyDmitriev'><img border=0 src='https://avatars.githubusercontent.com/u/1193082?v=2' height=16 width=16'></a> test


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may be better rename y?