Use strict equalities in src/core/{image, jpx, jpg, jbig2}.js

[timvandermeij]

/cc @Snuffleupagus for review.

Some useful test files are:

• http://people.reed.edu/~ahm/Courses/Reed-POL-372-2011-S3_IEP/Syllabus/EReadings/07.1/07.1.EhrlichHoldren1971-03-26Impact.pdf (for jbig2.js)
• http://dspace.mit.edu/bitstream/handle/1721.1/48833/planningsystemsc00rama.pdf (for jpx.js)
• http://vs.twonky.dk/invitation.pdf (for jpg.js)

[timvandermeij]

/botio-linux preview

[pdfjsbot]

From: Bot.io (Linux)

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Received

Command cmd_preview from @timvandermeij received. Current queue size: 0

Live output at: http://107.21.233.14:8877/1f75552beaf0501/output.txt

[pdfjsbot]

From: Bot.io (Linux)

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Success

Full output at http://107.21.233.14:8877/1f75552beaf0501/output.txt

Total script time: 0.76 mins

Published

• Viewer: http://107.21.233.14:8877/1f75552beaf0501/web/viewer.html
• B2G Viewer: http://107.21.233.14:8877/1f75552beaf0501/extensions/b2g/content/web/viewer.html
• Extension: http://107.21.233.14:8877/1f75552beaf0501/extensions/firefox/pdf.js.xpi
• Extension (AMO): http://107.21.233.14:8877/1f75552beaf0501/extensions/firefox/pdf.js.amo.xpi

[timvandermeij]

/botio test

[pdfjsbot]

From: Bot.io (Linux)

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Received

Command cmd_test from @timvandermeij received. Current queue size: 0

Live output at: http://107.21.233.14:8877/b038bdf2640efa3/output.txt

[pdfjsbot]

From: Bot.io (Windows)

---

Received

Command cmd_test from @timvandermeij received. Current queue size: 0

Live output at: http://107.22.172.223:8877/f809fe032649780/output.txt

[pdfjsbot]

From: Bot.io (Windows)

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Success

Full output at http://107.22.172.223:8877/f809fe032649780/output.txt

Total script time: 20.07 mins

• Font tests: Passed
• Unit tests: Passed
• Regression tests: Passed

[pdfjsbot]

From: Bot.io (Linux)

---

Success

Full output at http://107.21.233.14:8877/b038bdf2640efa3/output.txt

Total script time: 22.99 mins

• Font tests: Passed
• Unit tests: Passed
• Regression tests: Passed

[Snuffleupagus]

Looks good; thank you!