Remove duplicate requirements

These requirements are specified in setup.py
and require us to make duplicate changes when
bumping package versions.

requirements.txt

@@ -1,14 +1,9 @@
 tox>=2.3.1,<3.0.0
-docutils>=0.10
 # botocore and the awscli packages are typically developed
 # in tandem, so we're requiring the latest develop
-# branch of botocore when working on the awscli.
+# branch of botocore and s3transfer when working on the awscli.
 -e git://github.com/boto/botocore.git@develop#egg=botocore
 -e git://github.com/boto/s3transfer.git@develop#egg=s3transfer
--e git://github.com/boto/jmespath.git@develop#egg=jmespath
 nose==1.3.7
-colorama>=0.2.5,<=0.3.9
 mock==1.3.0
-rsa>=3.1.2,<=3.5.0
 wheel==0.24.0
-PyYAML>=3.10,<=3.13