update README.md for installation issues/solutions

README.md

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+Installation issues/solution
+------
+
+#### 1. When run bundle install, may met error:
+> Gem::RemoteFetcher::FetchError: Errno::ECONNRESET: Connection reset by peer - SSL_connect (https://rubygems.org/gems/minitest-5.6.0.gem)
+
+For RVM & OSX users
+
+  1. Make sure you use latest rvm:
+  	`rvm get stable`
+
+  2. Update certificates:
+    `rvm osx-ssl-certs update all`
+
+  3. Update rubygems:
+    `rvm rubygems latest`
+
+If the issue still there, it maybe because you are in China's network and Chinese gov stop the connection.
+You can use a VPN or just update the source in Gemfile:
+`source 'http://rubygems.org'`
+and run `bundle install` may fix the issue.
+
+
+
+####2. when run bundle install, may met error:
+
+> An error occurred while installing nokogiri (1.6.6.2), and Bundler cannot continue.
+Make sure that `gem install nokogiri -v '1.6.6.2'` succeeds before bundling.
+
+> checking for main() in -llzma... yes
+>
+> checking for xmlParseDoc() in libxml/parser.h... no
+
+> checking for xmlParseDoc() in -lxml2... no
+
+> checking for xmlParseDoc() in -llibxml2... no
+
+
+It may because there are something wrong with your libxml lib. If you are using Mac and brew, , just run:
+
+`brew unlink libxml2`
+`brew install libxml2 libxslt libiconv`
+
+Will solve the issue.
+
+
+If still met the issue, install nokogiri with specified lib path:
+
+`gem install nokogiri -v '1.6.5' -- --use-system-libraries --with-xml2-include=/usr/include/libxml2 --with-xml2-lib=/usr/lib`
+