10.0.0: Remove singleton logger

• Heads up: Removed possibility to inject log categories via Logger
  singleton. Requesting util.log.LogCategory instances will now always
  yield the RestContext log category.
  (@thekid)
• Made compatible with xp-framework/logging version 9.0.0 - @thekid

9.1.0: JSON objects

• Made it possible to force arrays and maps to be emitted as JSON objects
  by using an (object) cast.
  (@thekid)

9.0.1: String representation

• Restored webservices.rest.Rest{Request, Response}'s toString()
  (@thekid)

9.0.0: XP9 Compatibility

• Heads up: Drop PHP 5.5 support - @thekid
• Added forward compatibility with XP 9.0.0, see PR #24 - @thekid

8.3.3: Refactor typeof()

• Refactored code to use typeof() instead of xp::typeOf(), see
  xp-framework/rfc#323
  (@thekid)

8.3.2: GET parameters encoding fix

• Fixed double-encoding of resolved GET parameters - @aguel, @johannes85

8.3.1: Fix GET parameter resolution

• Merged PR #21: Fix GET parameters resolution - @johannes85, @thekid

8.3.0: Enum support

• Merged PR #19: Enum marshalling/demarshalling - @johannes85, @thekid

Url encoding fix

• Merged PR #18: Use rawurlencode() over urlencode() - @kiesel

8.2.0: Endpoint::with() overloading

• Changed Endpoint::with() to be liberal in what it accepts. It can now
  be called with both a map as single argument and with two arguments, the
  header and its value.
  (@thekid)