use circleci instead of travis (#511)

Upgrade rust-toolchain
Upgrade Tantivy
Warning: tantivy now use a different file format, search index may need to be deleted and recreated to work as intended
try to run compile twice in a row because sometime oomk is evil

.circleci/images/plume-buildenv/Dockerfile

@@ -0,0 +1,19 @@
+FROM debian:stretch-20190326
+ENV PATH="/root/.cargo/bin:${PATH}"
+
+#install native/circleci/build dependancies
+RUN apt update &&\
+    apt install -y git ssh tar gzip ca-certificates &&\
+    apt install -y binutils-dev build-essential cmake curl gcc gettext git libcurl4-openssl-dev libdw-dev libelf-dev libiberty-dev libpq-dev libsqlite3-dev libssl-dev make openssl pkg-config postgresql postgresql-contrib python zlib1g-dev
+
+#install and configure rust
+RUN curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain nightly-2019-03-23 -y &&\
+    rustup component add rustfmt clippy &&\
+    rustup component add rust-std --target wasm32-unknown-unknown &&\
+    cargo install cargo-web &&\
+    rm -fr ~/.cargo/registry
+
+#install coverage tools
+RUN curl -L https://github.com/SimonKagstrom/kcov/archive/master.tar.gz | tar xz &&\
+    mkdir -p kcov-master/build && cd kcov-master/build && cmake .. && make &&\
+    make install && cd ../.. && rm -rf kcov-master