Remove a rewrite rule that makes GHC 7.4.1 ill

The effect of the rule was to make isPrefixOf infloop; see [GHC bug
5783](http://hackage.haskell.org/trac/ghc/ticket/5783) for details.

This fixes gh-16.
Bump version to 0.11.1.13
Added tag 0.11.1.13 for changeset 6a3d847a56a6
implement strict Text to Builder encoder using BoundedEncodings

A first test of the infrastructure can be found in my 'aeson' branch.
implemented 'Text -> Builder' UTF-8 encoders

It uses a coupled end-of-input-and-output boundary and exploits the UTF-16
representation of the 'Text' value. According to preliminary benchmarks, it is
25% faster than the existing 'encodeUtf8 :: Text -> ByteString' function.

We also support an 'encodeUtf8AsciiEscaped' encoder that allows to special
case encoding of ASCII characters. This is a very useful function for
implementing escaping encoders, e.g., for JSON or HTML output.
implement 'encodeUtf8Builder' using 'encodeUtf8Escaped'
Reduce the amount of code generated for string literals

Previously, every Text literal generated a big wad of inefficient
code:

    {-# LANGUAGE OverloadedStrings #-}
    foo :: Text
    foo = "foo"

This would first convert to a String, then to a Text.  To make
matters worse, the code for conversion from String to Text was
inlined at every site where a string literal occurred (expected,
but undesired, behaviour).

In this change, we introduce a direct conversion from Addr# to each
of the Text types, and we ensure that uses of these never result in
excessive code generation.
Backport the fix for bug 19 to GHC < 7.2
Get the tests working with GHC 7.0
Expand dependency on test-framework
Bump version to 0.11.2.0, add release notes
Added tag 0.11.2.0 for changeset 1d2c6fa9092c
Add hGetChunk
Use integer-simple if the integer-simple flag is set.
Bump version to 0.11.2.1
Added tag 0.11.2.1 for changeset 78219784cf36
Bump dependency on bytestring
Bump version to 0.11.2.2
A small improvement in Text generation efficiency.

The specialised Run tuple avoids boxing and indirection for both
the MArray and Int parameters in the predecessor code.

I think I can do better, though.
Another try at improving Text generation.