Release v0.9.5

Fixes:

• Fixed Python 2.7.3 backwards compatible regexes (#325)
• Fixed documentation to specify Python patch version that mbed CLI was tested with (#325)
• mbed export -S/--supported should not require -i/--ide (#326)
• Convert '-' to '_' when matching pip installed packages and requirements.txt

Enhancements:

• Add Python version detection and report error when using incompatible version (#325)
• mbed update will update the tools in mbed 2.0/Classic programs (#331)
• mbed new will checkout the latest mbed-os release marked with tag latest (#330)
• Bump version to 0.9.5