Update TiKV build guide (pingcap#349)

Author: MyonKeminta

dev-guide/development.md

@@ -8,23 +8,23 @@ Before you begin, check the [supported platforms](./requirements.md#supported-pl
 
 ## Build TiKV
 
-After you install the RocksDB shared library, you can build TiKV directly without `ROCKSDB_SYS_STATIC`.
-
-+ Get the TiKV source code.
++ Get TiKV source code from GitHub
 
     ```bash
     git clone https://github.com/pingcap/tikv.git 
+    cd tikv
     ```
-+ Enter the source directory to build and install the binary in the `bin` directory.
+
++ Run all unit tests:
 
     ```bash
-    make
+    make test
     ```
-    
-+ Run unit test.
-    
+
++ Build in release mode:
+
     ```bash
-    make test
+    make release
     ```
 
 ## Build TiDB

dev-guide/requirements.md

@@ -12,10 +12,18 @@ The following table lists TiDB support for common architectures and operating sy
 
 ## Prerequisites
 
-+ Go [1.8+](https://golang.org/doc/install)
++ Go [1.9+](https://golang.org/doc/install)
 + Rust [nightly version](https://www.rust-lang.org/downloads.html)
 + GCC 4.8+ with static library
++ CMake 3.1+
 
 The [check requirement script](../scripts/check_requirement.sh) can help you check prerequisites and 
 install the missing ones automatically.
 
+
+TiKV is well tested in a certain Rust version by us, and the exact version can be found in the `RUST_VERSION` file in TiKV's root directory. We recommend you to use the same version as we do. To set Rust version, execute following command in your TiKV project directory:
+
+```bash
+rustup override set nightly-2018-01-12  # For example if our current version is `nightly-2018-01-12`
+cargo +nightly-2018-01-12 install rustfmt-nightly --version 0.3.4
+```