Adds custom 'filters' to the nunjucks templating engine

[paulmsmith]

Clean PR to merge the basic functionality of adding custom filters to the nunjucks template engine used by the gov.uk prototyping kit.

lib/core_filters.js is where I propose any future filters we want to include within the kit live. Which could be for example @edwardhorsford's proposed standard date filter

app/filters.js is where bespoke filters for each instance of the kit would live (where users will add their own filters).

cc: @joelanman

[joelanman]

hey could you add this example page? https://gist.github.com/joelanman/1b9cbab0086af57e2f267daf35bfd48e

[joelanman]

actually I might as well make that PR

[timpaul]

Just tried this on another machine and got this error:

/Users/timpaul/code/govuk_prototype_kit/server.js:48 filters = Object.assign(coreFilters, customFilters); ^ TypeError: Object function Object() { [native code] } has no method 'assign'

[paulmsmith]

Ah... What version of Node is that machine running? Myself and Joel thought
we might be safe dropping lodash dependency as Node ES6 coverage was
looking good but that will likely depend on what version of node you're
running.

Looking at this matrix: http://node.green/ we felt we might be fine.

On Sunday, 29 May 2016, Tim Paul notifications@github.com wrote:

Just tried this on another machine and got this error:

/Users/timpaul/code/govuk_prototype_kit/server.js:48
filters = Object.assign(coreFilters, customFilters);
^
TypeError: Object function Object() { [native code] } has no method
'assign'

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Regards,
Paul Smith
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Airfront Media Ltd
Front-end Development & Design
---------------------------------
Tel: *+44 0161 7957792
*URL: *http://www.airfront.co.uk
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[joelanman]

@timpaul what version of node? node -v

[timpaul]

Yeah, it was an old 0.x version. I updated and was good to go.

On 29 May 2016, at 16:38, Paul Michael Smith notifications@github.com wrote:

Ah... What version of Node is that machine running? Myself and Joel thought
we might be safe dropping lodash dependency as Node ES6 coverage was
looking good but that will likely depend on what version of node you're
running.

Looking at this matrix: http://node.green/ we felt we might be fine.

On Sunday, 29 May 2016, Tim Paul notifications@github.com wrote:

Just tried this on another machine and got this error:

/Users/timpaul/code/govuk_prototype_kit/server.js:48
filters = Object.assign(coreFilters, customFilters);
^
TypeError: Object function Object() { [native code] } has no method
'assign'

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or mute the thread
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.

Regards,
Paul Smith
---------------------------------
Airfront Media Ltd
Front-end Development & Design
---------------------------------
Tel: *+44 0161 7957792
*URL: *http://www.airfront.co.uk
*skype: airfront-paulsmith
---------------------------------
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