fix test deps, include lockfile, and fmt.

.gitignore

@@ -2,12 +2,13 @@
 # will have compiled files and executables
 /target/
 
-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
-# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
-Cargo.lock
-
 # These are backup files generated by rustfmt
 **/*.rs.bk
 
 # ViM Swap files
 **/*.swp
+
+# editor meta
+.vim/
+.vscode/
+.idea/

.rustfmt.toml

@@ -0,0 +1,14 @@
+max_width = 79
+hard_tabs = false
+tab_spaces = 4
+newline_style = "Auto"
+use_small_heuristics = "Default"
+reorder_imports = true
+reorder_modules = true
+remove_nested_parens = true
+fn_args_layout = "Tall"
+edition = "2018"
+merge_derives = true
+use_try_shorthand = false
+use_field_init_shorthand = false
+force_explicit_abi = true