cargo install cargo-web fails to compile/install

[mcrosson]

Plume version (and/or commit):

With the current Dockerfile cargo install cargo-web fails with the following error. The "fix" I found is to change the COPY Cargo.toml Cargo.lock ./ line to COPY . . and remove the subsequent copy from the Dockerfile.

   Compiling backtrace v0.3.13
error[E0658]: scoped lint `clippy::needless_pass_by_value` is experimental (see issue #44690)
  --> /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/pest-2.1.0/src/error.rs:97:13
   |
97 |     #[allow(clippy::needless_pass_by_value)]
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0658]: scoped lint `clippy::needless_pass_by_value` is experimental (see issue #44690)
   --> /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/pest-2.1.0/src/error.rs:137:13
    |
137 |     #[allow(clippy::needless_pass_by_value)]
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0658]: scoped lint `clippy::new_ret_no_self` is experimental (see issue #44690)
   --> /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/pest-2.1.0/src/parser_state.rs:114:13
    |
114 |     #[allow(clippy::new_ret_no_self)]
    |             ^^^^^^^^^^^^^^^^^^^^^^^

error[E0658]: scoped lint `clippy::new_ret_no_self` is experimental (see issue #44690)
  --> /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/pest-2.1.0/src/position.rs:52:13
   |
52 |     #[allow(clippy::new_ret_no_self)]
   |             ^^^^^^^^^^^^^^^^^^^^^^^

error[E0658]: scoped lint `clippy::new_ret_no_self` is experimental (see issue #44690)
  --> /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/pest-2.1.0/src/span.rs:56:13
   |
56 |     #[allow(clippy::new_ret_no_self)]
   |             ^^^^^^^^^^^^^^^^^^^^^^^

error[E0658]: scoped lint `clippy::all` is experimental (see issue #44690)
 --> /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/pest-2.1.0/src/unicode/mod.rs:6:10
  |
6 | #![allow(clippy::all)]
  |          ^^^^^^^^^^^

   Compiling base64 v0.9.3
   Compiling block-padding v0.1.2
   Compiling humantime v1.2.0
   Compiling regex-syntax v0.6.4
   Compiling walkdir v2.2.7
   Compiling textwrap v0.10.0
   Compiling tokio-executor v0.1.5
   Compiling smallvec v0.6.7
   Compiling want v0.0.6
error: aborting due to 6 previous errors

For more information about this error, try `rustc --explain E0658`.
error: Could not compile `pest`.
warning: build failed, waiting for other jobs to finish...

[trinity-1686a]

Fixed by #402