Remove duplicate contributors and correct counts

Remove contributors with different e-mail addresses but the same name.
I checked the commit logs for rust-lang/rust and both e-mail addresses
appear belong to the same person in each case.

Author: YawarRaza7349

_posts/2015-02-20-Rust-1.0-alpha2.md

@@ -32,7 +32,7 @@ in nightly.
 For more detail, please see the [Release
 notes](https://github.com/rust-lang/rust/blob/master/RELEASES.md#version-100-alpha2-february-2015). 
 
-Thank you to all 204 contributors for this release:
+Thank you to all 201 contributors for this release:
 
 * `Aaron Turon`
 * `Adam Roben`
@@ -46,12 +46,10 @@ Thank you to all 204 contributors for this release:
 * `Alex Crichton`
 * `Alexis`
 * `Alfie John`
-* `Alfie John`
 * `Andrea Canciani`
 * `Andrew Barchuk`
 * `Andrew Paseltiner`
 * `Ariel Ben-Yehuda`
-* `Ariel Ben-Yehuda`
 * `Armin Preiml`
 * `Artem`
 * `Barosl Lee`
@@ -129,7 +127,6 @@ Thank you to all 204 contributors for this release:
 * `Junseok Lee`
 * `Kang Seonghoon`
 * `Keegan McAllister`
-* `Keegan McAllister`
 * `Ken Tossell`
 * `KernelJ`
 * `Kevin Ballard`

_posts/2015-04-03-Rust-1.0-beta.md

@@ -70,7 +70,7 @@ the development phase, but you can see a [sample report][sr] here.
 
 As always, this Rust release is the achievement of the fantastic Rust
 community at large. Thanks to everyone who has participated in the RFC
-process, and a particular thank you to the 172 contributors for this
+process, and a particular thank you to the 170 contributors for this
 release:
 
 - `Aaron Turon`
@@ -223,8 +223,6 @@ release:
 - `Sébastien Marie`
 - `Seo Sanghyeon`
 - `Simonas Kazlauskas`
-- `Simonas Kazlauskas`
-- `Stepan Koltsov`
 - `Stepan Koltsov`
 - `Steve Klabnik`
 - `Steven Crockett`