Client / ClientBuilder / Clients refactoring
Improved based on feedback from review (2nd round)
Added information about "AccountStore during authentication" in changelog
Updated all 0.9.4 references to 1.0.alpha
Minor doc updates
Merge branch 'Client_ClientBuilder_Clients_refactoring' into mergetest

Conflicts:
	README.md
Merge branch 'Client_ClientBuilder_Clients_refactoring' into mergetest

Conflicts:
	README.md