Clarify install instructions
Use /usr/bin/env shebang - /usr/bin/python is not universal

On FreeBSD for example Python is /usr/local/bin/python.
Preliminary support for watchpoints
Merge pull request #2 from emaste/master

Use /usr/bin/env shebang - /usr/bin/python is not universal
Merge branch 'master' of github.com:pzion/zBug
Allow watch expressions
Add toolbar icons for disassembly widget
Use signals and slots to update toolbar actions
Use signals for stdout and stderr
move source code actions to source code window
Source status bar
Window menu
Icon changes
Icons
Better sources handling
Sources list improvements
Fixes for file selection
Contraction of source files in list
Fix for deleting breakpoint
Misc. changes