Implement modular compilation

pubspec.yaml

 name: dev_compiler
-# When updating this version, also update the version in lib/devc.dart.
-version: 0.1.24
+version: 0.2.0
 description: >
   Experimental Dart to JavaScript compiler designed to create idiomatic,
   readable JavaScript output.
 
 author: Dart Dev Compiler team <dev-compiler@dartlang.org>
 homepage: https://github.com/dart-lang/dev_compiler
 
 dependencies:
-  analyzer: ^0.27.3-alpha.5
+  analyzer: ^0.27.3
   args: ^0.13.0
   cli_util: ^0.0.1
   func: ^0.1.0
   html: ^0.12.0
   js: ^0.6.0
-  logging: ">=0.9.2 <0.12.0"
   path: ^1.3.0
   pub_semver: ^1.1.0
-  shelf: ">=0.5.6 <0.7.0"
-  shelf_static: ^0.2.1
   source_maps: ^0.10.0
   source_span: ^1.0.2
-  yaml: ^2.1.2
 
 dev_dependencies:
   # We pin a specific version to ensure everyone is formatting the code exactly
   # the same way. This is because any change in dart_style, even non-breaking
   # changes, may change the output format.
   dart_style: 0.2.4
   test: ^0.12.0
   webdriver: ^0.8.8
 
 environment:
   sdk: ">=1.12.0 <2.0.0"
 
 executables:
   # Similar to "analyzer.dart" and its command line "dartanalyzer" we use
   # "dartdevc".
   dartdevc: dartdevc
   dev_compiler: dartdevc
-  # Similar to dartdevc, but runs the (single) entry point with iojs (requires
-  # a very recent iojs next-nightly version).
-  dartdevrun: devrun