Update tmLanguage and move ST syntax into Syntaxes

• updated tmLanguage to accept escaped character in directive args
• moved Dockerfile.sublime-syntax into Syntaxes so the directory structure is unified

Handle escaped chars in directive args

FROM abc

RUN echo a=\"b+c\" >> test.txt
#          ^^ this used to cause error in syntax highlighting

Now fixed
funny GitHub highlights it wrong as well well

Allow comments and empty lines in multiline args

Thanks again @andyneff #7

Added highlighting invalid newlines for sublime text

Thanks @andyneff for #6

RUN apt-get update
    apt-get install curl
^^^^ this will now be highlighted as invalid

Added .sublime-syntax

v1.0.1

add converted sublime syntax