replace repl_show with writemime and display
rename error_show to show_error
remove showall(), start to remove summary()
add MIME_str macro
Merge branch 'master' of github.com:JuliaLang/julia into jb/repl_show_to_display

Conflicts:
	base/deprecated.jl
Merge branch 'master' of github.com:JuliaLang/julia into jb/repl_show_to_display
update with stevengj's comments
Merge branch 'master' of github.com:JuliaLang/julia into jb/repl_show_to_display
finish converting to MIME"" syntax and update doc
de-underscore show_error
eliminate showall(), it had repeated code, and we need a better approach
to truncated output.
Merge branch 'jb/repl_show_to_display' of github.com:JuliaLang/julia
reinstate showall, since we're not going to deal with display size yet