Add support for SLES 11

Adds support for SLES 11 using the package postgresql91.
remove duplicatie "description" line from Metadata.json
Fixed deprecation warning for class param  in server.pp. Changed subclasses of server to use ::_version, which will be assigned the value from globals or (deprecated) class param.
Merge puppetlabsmaster in initdb_ordering_issue
Fix typo
Merge pull request #437 from dinerroger/sles_support

Add support for SLES 11
Merge pull request #470 from igalic/patch-1

remove duplicatie "description" line from Metadata.json
Merge pull request #471 from poikilotherm/master

Fixed deprecation warning for class param  in server.pp.
Bump deps for postgresql 4.0 release
Merge pull request #448 from aswen/initdb_ordering_issue

Initdb should create xlogdir if it has been set.
Merge pull request #475 from hunner/bump_deps

Bump deps for postgresql 4.0 release