fix spelling errors in posts

Author: steveklabnik

_posts/2015-08-14-Next-year.md

@@ -214,7 +214,7 @@ that compiling Rust code for another target should be easy:
 #### Cargo install
 
 Cargo and [crates.io] is a really great tool for distributing
-libaries, but it lacks any means to install executables.  [RFC 1200] describes a
+libraries, but it lacks any means to install executables.  [RFC 1200] describes a
 simple addition to cargo, the `cargo install` command.  Much like the
 conventional `make install`, **`cargo install` will place an executable in your
 path so that you can run it**. This can serve as a simple distribution channel,

_posts/2016-03-02-Rust-1.7.md

@@ -88,7 +88,7 @@ See the [detailed release notes][notes] for more.
 There were a few small updates to Cargo:
 
 * An [improvement to build scripts] that allows them to precisely inform Cargo
-  about dependences to ensure that they’re only rerun when those files change.
+  about dependencies to ensure that they’re only rerun when those files change.
   This should help development quite a bit in repositories with build scripts.
 * A [modification to the `cargo rustc` subcommand], which allows specifying
   profiles to pull in dev-dependencies during testing and such.

_posts/2016-04-19-MIR.md

@@ -489,7 +489,7 @@ fn send_if(data: Vec<Data>) {
 ```
 
 Of course, you couldn't write code like this in Rust. You're not
-allowed to acccess the variable `data` after the `if`, since it might
+allowed to access the variable `data` after the `if`, since it might
 have been moved. (This is yet another example of where we can do
 things in MIR that we would not want to allow in full Rust.)