prepare for new release

[KristofferC]

• reexport some more breakpoint functionality (reexport some more breakpoint functionality #133)
• fix printing for the current evaluation level (fix printing for evaluation level and make fr show the current level by default instead of level 1 #142)
• make fr show the current level by default instead of level 1 (fix printing for evaluation level and make fr show the current level by default instead of level 1 #142)
• prevent erroring out of debugger on bad input commands (prevent erroring out of debugger if we add an argument to one of the JuliaInterpreter commands #143)
• use Base.error_color() in error messages to be consistent with Base for errors (use Base.error_color to be consistent with Base for errors #144)
• show an error message on empty first command (show an error message on empty first command #149)
• add an error message if trying to @enter a compiled function (add an error message if trying to enter a compiled function #151)
• show a stacktrace when breaking on error (WIP: show a nice stacktrace when breaking on error #147)
• add error message when using the macros on invalid expressions

[fredrikekre]

Should this be bumped to 0.4 too?

[KristofferC]

Yes, thanks.