Release 2.1

[ariya]

• Bump version number
• Update ChangeLog
• Update devDependencies (JSCS, Istanbul, ESLint, ...)
• Check for performance regression
• Test some important downstream projects
• Tag the repository
• Publish to npm
• Update web site

[ariya]

No performance regression is observed.

Before (2.0 branch):

    Underscore 1.5.2    42.5 KiB      6.75 ms ± 0.95%
      Backbone 1.1.0    58.7 KiB      6.84 ms ± 1.06%
      MooTools 1.4.5   156.7 KiB     35.19 ms ± 1.24%
        jQuery 1.9.1   262.1 KiB     36.40 ms ± 1.03%
          YUI 3.12.0   330.4 KiB     35.90 ms ± 0.80%
 jQuery.Mobile 1.4.2   442.2 KiB    114.46 ms ± 8.63%
       Angular 1.2.5   701.7 KiB     71.28 ms ± 5.00%
                     ------------------------
                      1994.3 KiB    306.82 ms ± 5.83%

After (current master branch):

    Underscore 1.5.2    42.5 KiB      7.12 ms ± 1.35%
      Backbone 1.1.0    58.7 KiB      6.65 ms ± 1.92%
      MooTools 1.4.5   156.7 KiB     33.16 ms ± 1.27%
        jQuery 1.9.1   262.1 KiB     35.18 ms ± 0.90%
          YUI 3.12.0   330.4 KiB     36.13 ms ± 1.94%
 jQuery.Mobile 1.4.2   442.2 KiB    102.43 ms ± 4.96%
       Angular 1.2.5   701.7 KiB     74.08 ms ± 3.97%
                     ------------------------
                      1994.3 KiB    294.74 ms ± 3.66%

[ariya]

No functional regression was observed on the following downstream projects:

• Istanbul (current master)
• JSCS (current master)
• escomplex-js (current master)

[ariya]

http://esprima.org/test/index.html is going to break if I update the web site. Temporarily, let's just redirect it to point to https://github.com/jquery/esprima/tree/master/test/fixtures.

[mikesherov]

FYI just filed #1102 to address documenting the release process fully.