Hardcode safe nightly build (#334)

* Use nightly-2019-01-09

* unignore Cargo.lock

* nightly-2019-01-09 -> nightly-2019-01-08

* set default toolchain explicitly

* Even more explicitly

* Add Cargo.lock -_-

* Hardcode toolchain for now

.gitignore

@@ -12,9 +12,6 @@ target/
 # MacOS folder metadata
 .DS_Store
 
-# Rust
-Cargo.lock
-
 # Text writing
 *.scriv
 

.travis.yml

@@ -10,9 +10,9 @@ matrix:
 
       before_install:
         - curl https://sh.rustup.rs -sSf | sh -s -- -y
-        - ~/.cargo/bin/rustup toolchain install nightly
+        - ~/.cargo/bin/rustup toolchain install nightly-2019-01-08
         - ~/.cargo/bin/rustup update
-        - ~/.cargo/bin/rustup target add wasm32-unknown-unknown --toolchain nightly
+        - ~/.cargo/bin/rustup target add wasm32-unknown-unknown --toolchain nightly-2019-01-08
 
       script:
         - PATH=$PATH:$HOME/.cargo/bin sbt -jvm-opts travis/jvmopts.compile compile
@@ -45,9 +45,9 @@ matrix:
 
       before_install:
         - curl https://sh.rustup.rs -sSf | sh -s -- -y
-        - ~/.cargo/bin/rustup toolchain install nightly
+        - ~/.cargo/bin/rustup toolchain install nightly-2019-01-08
         - ~/.cargo/bin/rustup update
-        - ~/.cargo/bin/rustup target add wasm32-unknown-unknown --toolchain nightly
+        - ~/.cargo/bin/rustup target add wasm32-unknown-unknown --toolchain nightly-2019-01-08
 
       # LlamadbIntegrationTest requires 2 Gb RAM and should be run only in PR
       script:
@@ -92,13 +92,13 @@ matrix:
     - name: rust App SDK
       language: rust
       # todo enable 'stable' and 'beta' when `allocator_api` will become stable
-      rust: nightly
+      rust: nightly-2019-01-08
       cache:
         - cargo
         - npm
 
       before_install:
-        - rustup component add rustfmt --toolchain nightly
+        - rustup component add rustfmt --toolchain nightly-2019-01-08
         - cd sdk/rust
 
       script:
@@ -109,18 +109,20 @@ matrix:
 
     - name: llamaDb VM App
       language: rust
-      rust: nightly
+      rust: nightly-2019-01-08
       cache: cargo
       sudo: false
       before_install:
-        - rustup component add rustfmt-preview --toolchain nightly
+        - rustup toolchain list
+        - rustup default nightly-2019-01-08
+        - rustup component add rustfmt
         - cd vm/examples/llamadb
 
       script:
-        - cargo fmt --all -- --check -v
-        - cargo build -v
-        - cargo doc -v
-        - cargo test -v
+        - cargo +nightly-2019-01-08 fmt --all -- --check -v
+        - cargo +nightly-2019-01-08 build -v
+        - cargo +nightly-2019-01-08 doc -v
+        - cargo +nightly-2019-01-08 test -v
 
     - name: Fluence CLI
       language: rust