Updated docs

Signed-off-by: Vishal Rana <vr@labstack.com>

website/content/guide/customization.md

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 ### HTTP error handler

website/content/guide/error-handling.md

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 Echo advocates centralized HTTP error handling by returning `error` from middleware

website/content/guide/installation.md

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 Echo has been developed and tested using Go `1.4.x`

website/content/guide/middleware.md

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 Middleware is a function which is chained in the HTTP request-response cycle. Middleware

website/content/guide/request.md

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 ### Path parameter

website/content/guide/response.md

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 ### Template

website/content/guide/routing.md

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 Echo's router is [fast, optimized]({{< relref "index.md#performance">}}) and