added-display-captions-option

[N-Shar-ma]

Added an option to display instagram post captions as overlay on the posts on hovering. display_caption is true by default. A screenshot of the caption visible on hovering is attached:

[jsanahuja]

Looks great! I made some small changes:

• Changed display_captions default value to false to avoid changing the current behavior for users that use the CDN.
• Replaced template string for a normal string (scaping line breaks) as this is not compatible in any version of IE.
• Added a condition to avoid adding any caption styles if display_captions is disabled.
• Changed max-width:100% for width:100% to avoid cases like this:

	->

Thank you!

[jsanahuja]

Closes #14

[N-Shar-ma]

This was my first ever pull request. Thank you for letting me contribute, and for explaining the tweaks you made. I learnt a lot from this experience 😊

[jsanahuja]

Noo, thank you for your work! Really appreciated