add example of initializing an array without literal

There was no example on how to initialize an array except for using a literal. For large arrays, initialization using a literal is not really an option.
fixed comment for example one

I believe Rust now infers the lifetime for the case described in the first example.
calling first example in main function
fixed Mul trait implementation for Vec2<T>

* added missing trait and struct name for Mul trait implementation
* use of current function name (mul instead of dot)
Fix dead_code warnings
Merge pull request #280 from GBGamer/master

Fixed all compilation issues, and renamed fail/fail.rs to panic/panic.rs
Say the explicit build commands to generate the docs in README.md
Merge pull request #272 from areski/pr-fix-enum-c-like

Fix dead_code warnings
Merge pull request #260 from battisti/master

fixed comment for example one
Fix build instructions
Merge pull request #217 from ruud-v-a/patch-1

Add example of initializing an array without literal
Merge remote-tracking branch 'upstream/master'
Undoing a change where I set GITBOOK to rustbook

In order to test rustbook.