less gender-specific reference in the opening paragraph

Rather than "fine fellows," which implies a boys' club, how about a slightly more inclusive alliteration? "Crafty coders" perhaps?
added fetch with blocks condition

blocks are lazy evaluated while the default value (provided as second argument) is eagerly evaluated
further refinement of opening paragraph
updated as per PR comments
Merge pull request #198 from dragosmiron/fetch-with-blocks

added fetch with blocks condition
style fix
Merge pull request #203 from dragosmiron/patch-1

style fix
Merge pull request #188 from drewda/patch-1

less gender-specific reference in the opening paragraph
Prefer Time.now over Time.new

The documentation says now is an alias for new. I believe Time.now more
clearly conveys that it uses the current time, whereas Time.new does not
convey the current time vs. an arbitrary, empty time object.

GitHub search indicates that Time.now is far more popular:

* Time.now has [376,997 code results](https://github.com/search?l=ruby&q=time.now&source=c&type=Code)
* Time.new has [18,858 code results](https://github.com/search?l=ruby&q=time.new&source=c&type=Code)

The ratio of now:new is approximately 20:1.
Merge pull request #206 from mark-rushakoff/time-new-now

Prefer Time.now over Time.new
Favor the use of predicate methods
Put fenced code block around shell command
Merge pull request #209 from lee-dohm/master

Put fenced code block around shell command
updated style guide with instructions for calling constructors
Merge pull request #210 from markijbema/add-constructor-exception

updated style guide with instructions for calling constructors
美容
美容；英文更新的序幕的引言；可能是新版的机械战警上映了？我加上个列宁的更为人熟知的类似的话。
序言修改。修正一个翻译错误。其它都是美容

况且这个世界再多一份公司司内部文件又有何意义
 the world had little need for another internal company guideline.
第二章节较多修改。之前版本有些翻译错误。
删除原文没有的引用