resolve symlinks in local files

the tar libraries choke when checking valid
filenames because they don't resolve symlinks
Merge branch 'hotfix/1.0.2'
Merge pull request #245 from ptone/find-links-symlinks

resolve symlinks in local files
Merge branch 'release/1.1'
Merge branch 'release/1.2'
Merge branch 'release/1.2.1'
Merge branch '1.3.X'
Merge branch '1.3.X'
Fixed typo in some help messages
Merge pull request #955 from Zearin/master

Fixed typo in some help messages
fix spelling of 'NotImplementedError'
Document how to configure pip to use wheels by default
Merge pull request #1008 from pfmoore/default_wheel_docs

Document how to configure pip to use wheels by default
Add external//insecure options to wheel and list commands
Add the --pre options to pip wheel and pip list
doc updates for supporting the new setuptools
Use PyPA's own test package instead of my personal repo (which I deleted due to move to Github).
unpack_file should use flatten=False for .whl files GH1011
Merge pull request #1015 from y-p/PR_GH1011

unpack_file should use flatten=False for .whl files GH1011
have "pip wheel" only be satisfied by setuptools