Use siesta 1.4-SNAPSHOT

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Fix AuthorizationExceptionMapper

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Map NoSuchRepositoryException to 404

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Map InvalidConfigurationException to 400 with ValidationErrorXO body

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Use guice server from nexus

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Merge remote-tracking branch 'origin/master' into siesta-1.4
Add siesta-common to nexus-client-core

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Merge remote-tracking branch 'origin/master' into siesta-1.4
Accept siesta error messages by default
Parse siesta error messages for failed requests automatically
Move Ext.Ajax configuration to ext/Ajax module
Extract parsing of HTML error message into Sonatype.utils
Merge pull request #763 from sonatype/siesta-1.4

Adapt to change in siesta 1.4(-SNAPSHOT)