[build] added gruntfile and package.json;
[cppengine] fixed declaration error;
[build] added build folder to .gitignore;
[build] added "keep mode" option to copy tasks;
[build] added shortcut for development (dev);
Merge branch 'feature/grunt' into experimental
[build] added dependencies to package.json and use it in build;
[any] increased json token count;
[sessions] added session alias support;
[build] fixed cpp engine build;
[multisessions] finished multisession feature;
[sessions] fixed tests;
[build] added --filter option to "grunt test";
Merge branch 'feature/multisessions' into experimental
[logging] use easylogger++ for logging;
Merge branch 'feature/logging' into feature/gcc4.7-support