Escape values that containt slash (/) at the begining - SOLR 4 intruduced regex queries and this commit is not introducing this functinoality but prevent breaking old code.
Fix slash in test.
Merge branch 'Solr4QuerySerialization' of git://github.com/zzapal/SolrNet.git

Conflicts:
	SolrNet.Tests/SolrQueryByFieldTests.cs
	SolrNet/Impl/QuerySerializers/QueryByFieldSerializer.cs