...使用一个 reactivedb 无需摇树的版本

添加的 `import 'rxjs/internal/symbol/observable` 是用来保证在
reactivedb 的 rxjs 依赖完全清瘦的情况下，SymbolConstructor 上的
observable 字段被挂上，令 ts 编译通过。

package.json

@@ -66,7 +66,7 @@
  "moment": "^2.18.1",
  "node-watch": "^0.5.8",
  "nyc": "^11.2.1",
- "reactivedb": "~0.11.0",
+ "reactivedb": "0.11.1-alpha.0-rxnotreeshake",
  "rollup": "^0.60.5",
  "rollup-plugin-alias": "^1.3.1",
  "rollup-plugin-commonjs": "^8.4.1",

src/rx.ts

@@ -1,3 +1,5 @@
+import 'rxjs/internal/symbol/observable'
+
 export { defer } from 'rxjs/internal/observable/defer'
 export { empty } from 'rxjs/internal/observable/empty'
 export { forkJoin } from 'rxjs/internal/observable/forkJoin'

yarn.lock

@@ -2449,9 +2449,10 @@ rc@1.2.5:
  minimist "^1.2.0"
  strip-json-comments "~2.0.1"
 
-reactivedb@~0.11.0:
- version "0.11.0"
- resolved "https://registry.npmjs.org/reactivedb/-/reactivedb-0.11.0.tgz#de0952b908455fb83094d38631462062c9f60fd4"
+reactivedb@0.11.1-alpha.0-rxnotreeshake:
+ version "0.11.1-alpha.0-rxnotreeshake"
+ resolved "https://registry.npmjs.org/reactivedb/-/reactivedb-0.11.1-alpha.0-rxnotreeshake.tgz#35ab43d561f039d063bb6ef06f00c511396c51f2"
+ integrity sha512-PtRRrdWTfO6FBoeiFq9iZet4ALu+n1z/WmYDJ2BVQBaM2T31cHgJu+t3uxV0INleE4mVKI8lkVkuKLu+bxoRgA==
  dependencies:
  "@types/lovefield" "^2.1.1"
  lovefield "2.1.12"