AMQP-241 Add package-info Files; Use SPR css

spring-erlang/src/main/java/org/springframework/erlang/connection/package-info.java

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+/**
+ * Provides classes supporting connections.
+ */
+package org.springframework.erlang.connection;

spring-erlang/src/main/java/org/springframework/erlang/core/package-info.java

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+/**
+ * Provides core classes for Spring Erlang.
+ */
+package org.springframework.erlang.core;

spring-erlang/src/main/java/org/springframework/erlang/package-info.java

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+/**
+ * Base package for Spring Erlang.
+ */
+package org.springframework.erlang;

spring-erlang/src/main/java/org/springframework/erlang/support/converter/package-info.java

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+/**
+ * Provides classes conversion between Java and Erlang types.
+ */
+package org.springframework.erlang.support.converter;

spring-erlang/src/main/java/org/springframework/erlang/support/package-info.java

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+/**
+ * Provides support classes for Spring Erlang.
+ */
+package org.springframework.erlang.support;

spring-erlang/src/main/java/org/springframework/util/exec/package-info.java

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+/**
+ * Provides classes supporting execution.
+ */
+package org.springframework.util.exec;