Replace Common.Logging with LibLog

Closes #265, made following changes:
* Removed references to Common.Logging
* Added LibLog files
* Replaced all usages of Common.Logging classes with LibLog classes
* Updated *.nuspec files
Build `dev` branch automatically on AppVeyor and Travis CI
Build pre-release packages on AppVeyor
Bump version to 1.3.0
Add some prerelease notes
Use psake instead of msbuild for building the project
Remove all files from Build folder
Ignore Build folder
Disable package restore
Remove deleted stuff from solution file
Remove unused files
Remove unused makefile
Rename psake files to keep them together
Update appveyor.yml file
Improve error code notification in build.bat
Version modification task for psake
Don't run redis tests on mono
Add AppVeyor overrides for msbuild and xunit
Run Test task by default in psake
Remove garbage assemblies