Merge pull request #7 from XChinux/master

add inc/Sql/MSSQL.h & src/Sql/MSSQL.cpp
2013.04.19 Jonix append classes.

2013.04.19 Jonix
append:
-->class Network/DownloadHttp
-->class Network/SingleInstance
-->class Core/StringList  (String.cpp)
-->method Core/Utils::searchFiles()
fixed some file's compile error in linux and Qt 4.8.4