travis: add cache and fix issues

.travis.yml

@@ -6,13 +6,22 @@ matrix:
       dist: trusty
       services: docker
       install: docker pull rust:1
-      script: docker run -v $(pwd):/liftinstall rust:1 /bin/bash -ex /liftinstall/.travis/build.sh
+      cache:
+        directories:
+          - $HOME/.cargo
+          - $TRAVIS_BUILD_DIR/ui/node_modules
+      script: docker run -v $HOME/.cargo:/root/.cargo -v $(pwd):/liftinstall rust:1 /bin/bash -ex /liftinstall/.travis/build.sh
 
     - os: osx
       language: rust
+      cache: cargo
       osx_image: xcode10
       script: brew install yarn && cargo build
 
     - os: windows
       language: rust
-      script: choco install nodejs yarn && cargo build
+      cache: cargo
+      script: 
+        - choco install nodejs yarn
+        - export PATH="$PROGRAMFILES/nodejs/:$PROGRAMFILES (x86)/Yarn/bin/:$PATH"
+        - cargo build