Document the maximum length of a bucket name

As per MB-5641 since Couchbase Server 2.2 the bucket name has been limited to 100 characters in the UI to prevent problems.

Can you ensure the following documentation pages include the information,
"The bucket name can only contain characters in range A-Z, a-z, 0-9 as well as underscore, period, dash and percent symbols and can only be a maximum of 100 characters in length."

http://docs.couchbase.com/couchbase-manual-2.5/cb-admin/#couchbase-admin-web-console-data-buckets-createedit
http://docs.couchbase.com/prebuilt/couchbase-manual-3.0/UI/ui-data-buckets.html
http://docs.couchbase.com/prebuilt/couchbase-manual-3.0/Misc/limits.html
http://docs.couchbase.com/couchbase-manual-2.5/cb-rest-api/#creating-and-editing-buckets
http://docs.couchbase.com/prebuilt/couchbase-manual-3.0/REST/rest-bucket-create.html