Fix text output for single scalar value

Fixes the case where a `--query` arg produces a single
value.  For example, this now works as expected:

  $ aws ec2 create-key-pair --key-name testkey --query KeyMaterial --output text > ~/.ssh/foobar.pem
Use shlex.split to properly split cmd args for pager

Fixes #393, verified that:

/bin/sh -c "col -bx | vim -c 'set ft=man' -"

Works for MANPAGER and aws help.
Merge branch 'manpager-split' into develop

* manpager-split:
  Use shlex.split to properly split cmd args for pager
Merge branch 'single-scalar-text' into develop

* single-scalar-text:
  Fix text output for single scalar value
Add requests to debug log

This contains information about connection pooling and
hostnames.
Merge branch 'requests-debug' into develop

* requests-debug:
  Add requests to debug log
Merge remote-tracking branch 'upstream/develop' into develop
Fix for bad example results