(Documentation) Add example of building a Solution File

- While trying out psbuild for the first time, I noticed that the documentation didn't include an example of passing a *.sln file
- Felt that this was required, as it is a common use case
Merge pull request #40 from gep13/AddSolutionExample

(Documentation) Add example of building a Solution File
Add support for building without supplying a sln/proj.

This allows the normal msbuild behaviour, which looks in the current
directory for a single item to build.
Added Mandatory=$true back for debugMode.

See #42; debugMode uses the API and requires the project to be passed.
Merge branch 'master' into dev
Merge pull request #42 from DanTup/master

Add support for building without supplying a sln/proj.
Merge branch 'master' into dev
correcting toolsdir
moving temp files under LigerShark folder