encoding: Fix bug in TlvEncoder.writeNonNegativeInteger: value <= 0xff should be encoded using 1 byte. Refs #1926.
 CHANGELOG: Added bug 1926: Should encode non-negative integers 253 through 255 as one byte. Refs #1926.
Merge branch 'issue/1926-nonNegativeIntegers-253-through-255'. Refs #1926.
http://redmine.named-data.net/issues/1926